BSIG


Line plots across dimensions of each concept
Tables

Table of contents


us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents
us-gaap:SharesOutstanding
us-gaap:ConsolidatedEntities
us-gaap:CommonStockSharesIssued

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
us-gaap:InvestmentType, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementGeographical

us-gaap:Revenues
us-gaap:ConsolidatedEntities
us-gaap:StatementBusinessSegments
us-gaap:SubsegmentsConsolidationItems
us-gaap:ConsolidatedEntities
us-gaap:GainLossOnInvestments
us-gaap:ConsolidatedEntities
us-gaap:OtherIncome

us-gaap:OperatingExpenses
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:GeneralAndAdministrativeExpense

us-gaap:OperatingIncomeLoss
us-gaap:ConsolidatedEntities
us-gaap:InterestExpense
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:InterestIncomeExpenseNet
us-gaap:StatementBusinessSegments
us-gaap:SubsegmentsConsolidationItems

us-gaap:InterestPaidNet

us-gaap:IncomeLossFromContinuingOperations

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:NonoperatingIncomeExpense

us-gaap:IncomeTaxExpenseBenefit
us-gaap:StatementBusinessSegments
us-gaap:SubsegmentsConsolidationItems

us-gaap:ProfitLoss
us-gaap:StatementBusinessSegments
us-gaap:SubsegmentsConsolidationItems

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities
us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:NetIncomeLoss
us-gaap:StatementBusinessSegments
us-gaap:SubsegmentsConsolidationItems

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest
us-gaap:ConsolidatedEntities
us-gaap:SubsegmentsConsolidationItems

us-gaap:Assets
bsig:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:Liabilities
bsig:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:LiabilitiesAndStockholdersEquity
us-gaap:ConsolidatedEntities
us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:AmortizationOfIntangibleAssets
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:PropertyPlantAndEquipmentNet

us-gaap:Goodwill
us-gaap:ConsolidatedEntities
us-gaap:StatementBusinessSegments
us-gaap:ConsolidatedEntities
us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:FiniteLivedIntangibleAssetsNet
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:OperatingLeaseRightOfUseAsset
us-gaap:ConsolidatedEntities
us-gaap:EquitySecuritiesFvNi
us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:CreditFacility, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:LongtermDebtType
us-gaap:LongTermDebt
us-gaap:DebtInstrument, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:LongtermDebtType
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:LongtermDebtType
us-gaap:ConsolidatedEntities
us-gaap:MinorityInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities
us-gaap:AdditionalPaidInCapital
us-gaap:ConsolidatedEntities
us-gaap:RetainedEarningsAccumulatedDeficit
us-gaap:ConsolidatedEntities
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
us-gaap:ConsolidatedEntities
us-gaap:MinorityInterest

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementBusinessSegments
us-gaap:SubsegmentsConsolidationItems

us-gaap:ProfitLoss
us-gaap:StatementBusinessSegments
us-gaap:SubsegmentsConsolidationItems
us-gaap:ConsolidatedEntities
us-gaap:DepreciationDepletionAndAmortization
us-gaap:ConsolidatedEntities
us-gaap:DeferredIncomeTaxExpenseBenefit
us-gaap:ConsolidatedEntities
us-gaap:AmortizationOfFinancingCosts

us-gaap:NetCashProvidedByUsedInInvestingActivities
us-gaap:ConsolidatedEntities
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment
us-gaap:ConsolidatedEntities
us-gaap:PaymentsToAcquireInvestments

us-gaap:NetCashProvidedByUsedInFinancingActivities
us-gaap:ConsolidatedEntities
us-gaap:ProceedsFromIssuanceOfLongTermDebt
us-gaap:ConsolidatedEntities
us-gaap:RepaymentsOfLongTermDebt
us-gaap:ConsolidatedEntities
us-gaap:PaymentsOfDividends
us-gaap:ConsolidatedEntities
us-gaap:PaymentsForRepurchaseOfCommonStock

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

bsig:AdjustmentsToAdditionalPaidInCapitalInPermanentAndTemporaryEquitiesSharebasedCompensationRequisiteServicePeriodRecognitionValue

bsig:AffiliateKeyEmployeeDistributions
us-gaap:StatementBusinessSegments
us-gaap:ConsolidatedEntities
bsig:AmortizationAndRevaluationOfNonCashCompensationAwards
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
bsig:AmortizationOfIntangibleAssetsIncludingDiscontinuedOperations

bsig:CapitalContributionsRedemptions
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

bsig:CapitalContributionsRedemptionsinPermanentandTemporaryEquities

bsig:DividendsRedemptionsInPermanentAndTemporaryEquities

bsig:ENIOperatingExpenses
us-gaap:StatementBusinessSegments
us-gaap:SubsegmentsConsolidationItems

bsig:EarningsAfterKeyEmployeeDistributions
us-gaap:StatementBusinessSegments
us-gaap:SubsegmentsConsolidationItems

bsig:EarningsBeforeVariableCompensation
us-gaap:StatementBusinessSegments
us-gaap:SubsegmentsConsolidationItems
us-gaap:ConsolidatedEntities
bsig:IncreaseDecreaseInAccountsPayableAndAccrualsAndAccruedIncomeTaxes
us-gaap:ConsolidatedEntities
bsig:IncreaseDecreaseInOtherReceivablesPrepaymentsDepositsAndOtherAssets
us-gaap:ConsolidatedEntities
bsig:IncreaseDecreaseInReceivablesOtherAssets
us-gaap:ConsolidatedEntities
bsig:IncreaseDecreaseinAccruedIncentiveCompensationOtherAmountsDuetoRelatedPartiesandOtherLongTermLiabilities
us-gaap:ConsolidatedEntities
bsig:IncreaseDecreaseinInvestmentAdvisoryFeesReceivableandRelatedPartyReceivables
us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel
bsig:InvestmentFairValueDisclosurePercentageofInvestmentHeldinCash
us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel
bsig:InvestmentFairValueDisclosurePercentageofInvestmentHeldinEquitySecurities

bsig:NetIncomeLossAvailabletoCommonStockholdersNetofParticipatingUnvestedSecurities

bsig:NetIncomeLossIncludingPortionAttributableToNoncontrollingInterestBeforeAllocationToTemporaryEquities
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities
bsig:NonCashPayableForPurchaseOfSecurities

bsig:OperatingEarningsAfterVariableCompensation
us-gaap:StatementBusinessSegments
us-gaap:SubsegmentsConsolidationItems

bsig:OtherComprehensiveIncomeLossDerivativesQualifyingasHedgesAmortizationNetofTax

bsig:OtherComprehensiveIncomeLossInPermanentAndTemporaryEquitiesForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

bsig:OtherIncomeExpenseReimbursement
us-gaap:ConsolidatedEntities
bsig:PaymentsforContributionstoEquityMethodInvestees
us-gaap:ConsolidatedEntities
bsig:PaymentsforNoncontrollingInterestCapitalRedeemed
us-gaap:ConsolidatedEntities
bsig:PaymenttoFormerParentforRedemptionofCoinvestments
us-gaap:ConsolidatedEntities
bsig:ProceedsfromEquityMethodInvestmentDistributionAndSale
us-gaap:ConsolidatedEntities
bsig:ProceedsfromRedeemableNoncontrollingInterestCapitalRaised

bsig:ProfitLossPermanentAndTemporaryEquities
us-gaap:ConsolidatedEntities
bsig:RedemptionOfRedeemableNonControllingInterestCapital
us-gaap:ConsolidatedEntities
bsig:SaleOfInvestmentSecuritiesandOtherInvestmentSecuritiesActivity

bsig:StockRepurchasedDuringPeriodValuePermanentandTemporaryEquities

bsig:VariableCompensation
us-gaap:StatementBusinessSegments
us-gaap:SubsegmentsConsolidationItems

us-gaap:CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations

us-gaap:CommonStockDividendsPerShareCashPaid

us-gaap:DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
us-gaap:ConsolidatedEntities

us-gaap:Dividends
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities
us-gaap:EquityMethodInvestmentDividendsOrDistributions
us-gaap:ConsolidatedEntities
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FinitelivedIntangibleAssetsAcquired1

us-gaap:GoodwillImpairmentLoss
us-gaap:ConsolidatedEntities
us-gaap:StatementBusinessSegments
us-gaap:ConsolidatedEntities
us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncomeTaxesPaid
us-gaap:ConsolidatedEntities
us-gaap:IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
us-gaap:ConsolidatedEntities
us-gaap:InvestmentIncomeInterest

us-gaap:InvestmentIncomeNet
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:InvestmentType
us-gaap:SubsegmentsConsolidationItems
us-gaap:ConsolidatedEntities
us-gaap:InvestmentIncomeNonoperating
us-gaap:ConsolidatedEntities, us-gaap:InvestmentType
us-gaap:ConsolidatedEntities
us-gaap:LaborAndRelatedExpense

us-gaap:NetCashProvidedByUsedInFinancingActivitiesContinuingOperations

us-gaap:NetCashProvidedByUsedInInvestingActivitiesContinuingOperations

us-gaap:NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
us-gaap:ConsolidatedEntities

us-gaap:NoncontrollingInterestIncreaseFromBusinessCombination
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

us-gaap:NumberOfReportableSegments

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeasePayments

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities
us-gaap:PaymentsOfDistributionsToAffiliates
us-gaap:ConsolidatedEntities
us-gaap:ProceedsFromSaleMaturityAndCollectionsOfInvestments

us-gaap:ReclassificationFromAociCurrentPeriodTax
us-gaap:StatementEquityComponents

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesNewIssues
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents
us-gaap:StockRepurchasedDuringPeriodShares

us-gaap:StockRepurchasedDuringPeriodValue
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents
us-gaap:ConsolidatedEntities
us-gaap:TemporaryEquityNetIncome

us-gaap:TreasuryStockAcquiredAverageCostPerShare

us-gaap:TreasuryStockSharesAcquired

us-gaap:TreasuryStockValueAcquiredCostMethod

us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic

us-gaap:VariableLeaseCost
us-gaap:ConsolidatedEntities
bsig:CommonStockandPreferredStockFairValueDisclosure
us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:ConsolidatedEntities
bsig:DuetoFormerParentOtherObligationsCurrentandNoncurrent

bsig:EquityAccountedInvestmentsInAffiliatesAndConsolidatedFunds
us-gaap:FiniteLivedIntangibleAssetsByMajorClass
bsig:FiniteLivedIntangibleAssetsAccumulatedAmortizationAndImpairment
us-gaap:ConsolidatedEntities
bsig:InvestmentAdvisoryFeesReceivable
us-gaap:ConsolidatedEntities
bsig:ShorttermInvestmentFundsFairValueDisclosure
us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel

bsig:TotalEquityIncludingTemporaryEquityCarryingAmountAttributableToNoncontrollingInterest
bsig:InvestmentsByConsolidatedAndNonconsolidatedEntities
bsig:VariableInterestEntityNonconsolidatedEquityInterests
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
us-gaap:ConsolidatedEntities
us-gaap:AccruedIncomeTaxes
us-gaap:ConsolidatedEntities
us-gaap:AlternativeInvestment
us-gaap:ConsolidatedEntities, us-gaap:InvestmentType

us-gaap:AssetsFairValueDisclosure
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DebtInstrumentFaceAmount
us-gaap:ConsolidatedEntities
us-gaap:DeferredCompensationLiabilityCurrentAndNoncurrent
us-gaap:ConsolidatedEntities
us-gaap:DeferredIncomeTaxAssetsNet
us-gaap:ConsolidatedEntities
us-gaap:DerivativeAssets
us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:ConsolidatedEntities
us-gaap:DerivativeLiabilities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:ConsolidatedEntities
us-gaap:EmployeeRelatedLiabilitiesCurrentAndNoncurrent
us-gaap:ConsolidatedEntities
us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
us-gaap:ConsolidatedEntities
us-gaap:FinancialInstrumentsSoldNotYetPurchasedAtFairValue

us-gaap:FinancialLiabilitiesFairValueDisclosure
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:GoodwillGross
us-gaap:StatementBusinessSegments

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss
us-gaap:StatementBusinessSegments
us-gaap:ConsolidatedEntities
us-gaap:IncomeTaxReceivable

us-gaap:Investments
us-gaap:ConsolidatedEntities

us-gaap:InvestmentsFairValueDisclosure
bsig:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:ConsolidatedEntities, us-gaap:InvestmentType
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:LineOfCredit
us-gaap:RelatedPartyTransaction, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:LoansAndLeasesReceivableRelatedParties
us-gaap:ConsolidatedEntities
us-gaap:LoansReceivableFairValueDisclosure
us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:CreditFacility, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:LongtermDebtType
us-gaap:LongTermDebtFairValue
us-gaap:DebtInstrument, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:LongtermDebtType
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:LongtermDebtType
us-gaap:ConsolidatedEntities
us-gaap:NonRecourseDebt
us-gaap:RelatedPartyTransaction, us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:NotesReceivableRelatedParties

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent
bsig:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:OtherAssets
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
bsig:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:OtherLiabilities
us-gaap:ConsolidatedEntities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:ConsolidatedEntities
us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount
us-gaap:ConsolidatedEntities
us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue
us-gaap:ConsolidatedEntities
us-gaap:TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests
us-gaap:ConsolidatedEntities
us-gaap:TradingSecuritiesDebt
us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel
bsig:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:VariableInterestEntityEntityMaximumLossExposureAmount
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
bsig:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:VariableInterestEntityNonconsolidatedCarryingAmountAssets
bsig:InvestmentsByConsolidatedAndNonconsolidatedEntities
us-gaap:VariableInterestEntityNonconsolidatedCarryingAmountLiabilities

Tables

  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
 us-gaap:SharesOutstanding us-gaap:ConsolidatedEntities,us-gaap:StatementEquityComponents bsig:ConsolidatedEntityExcludingConsolidatedFunds,us-gaap:CommonStock▁▂▂▃▄▄▇▇██80.182.585.988.891.691.9105.2106.3108.9110.5
 us-gaap:CommonStockSharesIssued us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▁▂▅▆█80.09969682.48276885.88637188.77673191.59232NA105.160021NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▁▂▂▃▄▅▇▇██80.485.185.990.091.597.8105.8106.5108.6109.6
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ▁▂▂▃▄▅▇▇██80.485.185.990.091.597.6105.6106.4108.4109.4
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 7.474NANA8.978.97NANANANANA
us-gaap:EarningsPerShareBasic ▃▄██▃▅▃▅▁▅2.3000000000000002e-073.8e-077.900000000000001e-078.4e-073.1e-075.4e-072.2e-075.1e-072e-085.2e-07
us-gaap:EarningsPerShareDiluted ▃▄██▃▅▃▅▁▅2.3000000000000002e-073.8e-077.900000000000001e-078.4e-073.1e-075.4e-072.2e-075.1e-072e-085.2e-07
us-gaap:IncomeLossFromContinuingOperationsPerBasicShare ▃▄▇█▃▅▃▅▁2.3000000000000002e-073.8e-077.700000000000003e-078.4e-073.1e-075.4e-072.1999999999999998e-075.1e-072e-08NA
us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare ▃▄▇█▃▅▃▅▁2.3000000000000002e-073.8e-077.700000000000003e-078.4e-073.1e-075.4e-072.1999999999999998e-075.1e-072e-08NA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▁▂▄▃▄▄▅▆▆█170.7178.5207.4196.4205.9207.5214.5229.6226.4249.7
us-gaap:Revenues ▁▂▄▃▄▄▅▆▇█174.7182.6207.4197.8207.1207.2214.5230.1233.9249.7
 us-gaap:GainLossOnInvestments us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▆▁▇▅▆█▄▆6.1-23.111.73.44.618.3-8.14.7NANA
 us-gaap:GainLossOnInvestments us-gaap:ConsolidatedEntities bsig:ConsolidatedFunds█▁▆▆▂▇▄▆4.7-12.0-0.80.8-9.52.6-5.3-0.8NANA
 us-gaap:OtherIncome us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▃▂▂▁▁▁▅▁█2.01.61.71.41.51.42.41.43.3NA
us-gaap:OperatingExpenses ▄▁▂▃▄▃▆██148.5108.5123.6145.9160.5139.2184.9216.8218.6NA
 us-gaap:GeneralAndAdministrativeExpense us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▁▃▇▅▅▆█▅▄24.527.733.531.731.132.535.731.029.8NA
us-gaap:OperatingIncomeLoss ▂▇█▅▄▆▃▁▁▂26.274.183.851.946.668.029.613.315.325.6
 us-gaap:InterestExpense us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▄▅▆▇█▃▁▂▁7.47.88.18.38.87.06.26.36.1NA
 us-gaap:InterestExpense us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:StatementEquityComponents us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest█▁█▁█0.80.70.80.70.8NA0.70.70.7NA
us-gaap:InterestIncomeExpenseNet ▄▃▃▂▁▆█▇-7.2-7.5-7.7-7.9-8.5-5.9-5.0-5.4NANA
 us-gaap:InterestIncomeExpenseNet us-gaap:StatementBusinessSegments us-gaap:AllOtherSegments▄▄-5.6-5.6NA-5.7-6.2-3.5NA-3.1NANA
 us-gaap:InterestIncomeExpenseNet us-gaap:SubsegmentsConsolidationItems us-gaap:MaterialReconcilingItems█▁-1.6-1.9NA-2.2-2.3-2.4NA-2.3NANA
us-gaap:InterestPaidNet ▁█3.210.1NA10.84.69.4NANANANA
us-gaap:IncomeLossFromContinuingOperations ▅▃▇█▃▆▂▅▁53.922.174.383.021.661.118.854.12.5NA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments ▆▄█▅▄▇▃▁▁█61.235.788.651.035.782.734.910.76.183.5
us-gaap:NonoperatingIncomeExpense █▁▅▅▄▆▅▄▄35.0-38.44.8-0.9-10.914.75.3-2.6-9.2NA
us-gaap:IncomeTaxExpenseBenefit ▆▇▇▂▇█▇▁▆7.313.614.3-32.014.121.616.1-43.43.6NA
us-gaap:ProfitLoss ▅▃▇█▃▆▂▅▁53.922.174.383.021.661.118.854.22.5NA
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax ▅▁█▃▄▆▄▄▂0.3-2.11.9-0.8-0.60.5-0.5-0.4-1.6NA
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▅▁█▃▄▆▄▄0.9-1.62.5-0.20.01.10.10.2NANA
 us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest us-gaap:ConsolidatedEntities bsig:ConsolidatedFunds█▁35.0-10.5NANA-6.48.4NANANANA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest NA-1.6242.5-0.20.01.1130.40.2-1.0NA
us-gaap:NetIncomeLoss ▃▄██▃▇▃▆▁▆18.932.674.375.428.061.118.854.02.154.8
us-gaap:ComprehensiveIncomeNetOfTax ▃▄██▄▆▃▆▁19.831.070.375.228.053.823.154.21.1NA
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest █▁35.0-10.5NA7.6-6.48.4NA0.2NANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:Assets ▃▃▁█▄1422.81423.51419.71432.31425.1NA1553.7NANANA
us-gaap:Liabilities ▁▃▃▆█1190.31229.71221.31279.61321.5NA1377.6NANANA
us-gaap:LiabilitiesAndStockholdersEquity ▃▃▁█▄1422.81423.51419.71432.31425.1NA1553.7NANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
 us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▆█▅▆▁115.8124.4111.3116.595.9NA340.6NANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:AmortizationOfIntangibleAssets █▁1.91.6NANA1.7NANANANANA
 us-gaap:PropertyPlantAndEquipmentNet us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds█▆▅▄▁70.966.665.863.558.3NA49.0NANANA
us-gaap:Goodwill ▁██258.2308.5308.5NA274.6308.5308.5NANANA
 us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▁▃▅▆█61.663.565.166.868.4NA71.7NANANA
us-gaap:FiniteLivedIntangibleAssetsNet ▁▅█60.662.564.1NANANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset ██▁▁▂108.7105.337.740.343.4NANANANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▁▄▇██31.537.444.345.946.5NA43.2NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:ConsolidatedEntities,us-gaap:FairValueByFairValueHierarchyLevel bsig:ConsolidatedEntityExcludingConsolidatedFunds,us-gaap:FairValueInputsLevel1▁▄▇██21.127.933.235.235.9NA35.0NANANA
 us-gaap:EquitySecuritiesFvNi us-gaap:ConsolidatedEntities,us-gaap:FairValueByFairValueHierarchyLevel bsig:ConsolidatedEntityExcludingConsolidatedFunds,us-gaap:FairValueInputsLevel2▅▁█▆▆10.49.511.110.710.6NA8.2NANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
 us-gaap:LongTermDebt us-gaap:CreditFacility,us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:LongtermDebtType us-gaap:RevolvingCreditFacility,us-gaap:FairValueInputsLevel2,us-gaap:LineOfCredit▁█▂▄▇130.0220.0140.0175.0210.0NA0.0NANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:LongtermDebtType bsig:NonrecourseSeedCapitalFacility,us-gaap:FairValueInputsLevel2,us-gaap:LineOfCredit▁▁██▃21.721.735.035.025.0NA0.0NANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:LongtermDebtType bsig:SeniorNotes4.80due2026,us-gaap:FairValueInputsLevel2,us-gaap:SeniorNotes█▆▃▁▁272.6272.5272.4272.3272.3NA272.2NANANA
 us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:LongtermDebtType bsig:SeniorNotes5.125due2031,us-gaap:FairValueInputsLevel2,us-gaap:SeniorNotes███▄▁121.4121.4121.4121.3121.2NA121.1NANANA
 us-gaap:LongTermDebt us-gaap:FairValueByFairValueHierarchyLevel us-gaap:FairValueInputsLevel2▁█▃▆▇545.7635.6568.8603.6628.5NA393.3NANANA
 us-gaap:LongTermDebt us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:LongtermDebtType us-gaap:FairValueInputsLevel2,bsig:NonrecourseSeedCapitalFacility▁▁█21.721.735.0NANANANANANANA
 us-gaap:LongTermDebt us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:LongtermDebtType us-gaap:FairValueInputsLevel2,bsig:ThirdPartyDebtArrangement▁█▂524.0613.9533.8NANANANANANANA
 us-gaap:MinorityInterest us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▂▁▁█▇1.41.31.31.91.8NA1.6NANANA
 us-gaap:MinorityInterest us-gaap:ConsolidatedEntities bsig:ConsolidatedFunds█▃▃▂▁78.849.148.840.132.7NA29.3NANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest ▇▆▆▄▂▁▆▅▇█152.6119.3114.570.821.88.4134.2101.3149.1172.0
 us-gaap:AdditionalPaidInCapital us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▁▃▅█500.6516.2534.3560.4NANA764.6NANANA
 us-gaap:MinorityInterest us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▂▁▁█▇1.41.31.31.91.8NA1.6NANANA
 us-gaap:MinorityInterest us-gaap:ConsolidatedEntities bsig:ConsolidatedFunds█▃▃▂▁78.849.148.840.132.7NA29.3NANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue ▁▂▂▁▃▇█▃▄0.51.11.10.71.23.23.51.31.6NA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▆▇█▇▁▇▇95.5-33.545.181.027.9-292.552.352.4NANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▇▆█▆▅▅▅▁7.81.317.81.5-5.9-4.4-1.2-31.4NANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁█▃▃▆█▅▇-109.242.4-66.6-61.1-3.836.5-27.118.9NANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▇▇▇█▇▁██-5.910.2-3.721.418.2-260.424.039.9NANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities █▆▇█▇▁▇▇95.5-33.545.181.027.9-292.552.352.4NANA
us-gaap:NetIncomeLoss ▃▄██▃▇▃▆▁▆18.932.674.375.428.061.118.854.02.154.8
us-gaap:ProfitLoss ▅▃▇█▃▆▂▅▁53.922.174.383.021.661.118.854.22.5NA
 us-gaap:DepreciationDepletionAndAmortization us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▇█▇▅▃▂▃▂▁5.15.35.04.44.03.83.93.73.5NA
 us-gaap:DeferredIncomeTaxExpenseBenefit us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▃█▇▃▃▄▄▁0.922.818.21.9-0.56.23.4-7.4NANA
 us-gaap:AmortizationOfFinancingCosts us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▆██▃▁▃▃▁1.01.11.10.90.80.90.90.8NANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▇▆█▆▅▅▅▁7.81.317.81.5-5.9-4.4-1.2-31.4NANA
 us-gaap:PaymentsToAcquirePropertyPlantAndEquipment us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▇▁▃██▃▃▁9.46.37.29.69.87.37.26.5NANA
 us-gaap:PaymentsToAcquireInvestments us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▅▅▁▆█▅▃█5.74.8-134.634.7119.47.0-74.1105.9NANA
 us-gaap:PaymentsToAcquireInvestments us-gaap:ConsolidatedEntities bsig:ConsolidatedFunds▁█21.025.1NANA93.732.7NANANANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁█▃▃▆█▅▇-109.242.4-66.6-61.1-3.836.5-27.118.9NANA
 us-gaap:ProceedsFromIssuanceOfLongTermDebt us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▁█0.080.0NA220.025.0240.0NA0.0NANA
 us-gaap:RepaymentsOfLongTermDebt us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds█▁90.013.3NA245.025.05.0NA0.0NANA
 us-gaap:PaymentsOfDividends us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▁▆▆▅█▇██0.55.85.75.07.46.47.87.9NANA
 us-gaap:PaymentsForRepurchaseOfCommonStock us-gaap:ConsolidatedEntities bsig:ConsolidatedEntityExcludingConsolidatedFunds▂▂▂▂▁█▁▂18.217.127.225.43.3183.99.134.6NANA
  2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31

None

us-gaap:SharesOutstanding us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

us-gaap:SharesOutstanding

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:CommonStock


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value808285889191105106108110109114
Percentage of SharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:CommonStockSharesIssued us-gaap:ConsolidatedEntities

us-gaap:CommonStockSharesIssued

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value8082858891105
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0

None

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value808585909197105106108109
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value808585909197105106108109
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


None
Period End2020-06-302019-09-302019-06-30
Value7474000.08970000.08970000.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0

None

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.230.380.790.840.310.540.220.510.020.52
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.230.380.790.840.310.540.220.510.020.52
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.230.380.770.840.310.540.220.510.02
Percentage of IncomeLossFromContinuingOperationsPerBasicShare100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.230.380.770.840.310.540.220.510.02
Percentage of IncomeLossFromContinuingOperationsPerDilutedShare100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value170178207196205207214229226249
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues97.797.8100.099.399.4100.1100.099.896.8100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidatedEntities, us-gaap:ProductOrService

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:AssetManagement1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value170178197196205207204229226
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.095.1100.0100.0100.095.1100.0100.0
Percentage of Revenues97.797.895.199.399.4100.195.199.896.8
Percentage of Revenues bsig:ConsolidatedEntityExcludingConsolidatedFunds us-gaap:AssetManagement10.00.00.00.00.00.00.00.00.0

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:InvestmentPerformance


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.31.06.8-1.9-2.2-2.86.9-2.13.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.63.3-1.0-1.1-1.33.2-0.91.3
Percentage of Revenues0.20.53.3-1.0-1.1-1.43.2-0.91.3
Percentage of Revenues bsig:ConsolidatedEntityExcludingConsolidatedFunds us-gaap:InvestmentPerformance0.00.00.00.00.00.00.00.00.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:InvestmentType, us-gaap:StatementBusinessSegments

bsig:Alternatives, bsig:Alternatives


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value414137434354
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax24.523.218.921.121.123.8
Percentage of Revenues23.922.718.821.021.123.7
Percentage of Revenues bsig:Alternatives bsig:Alternatives0.00.00.00.00.00.0

bsig:GlobalNonUSEquity, bsig:LiquidAlphaDomain


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value19182226
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.710.510.812.7
Percentage of Revenues11.410.310.812.7
Percentage of Revenues bsig:GlobalNonUSEquity bsig:LiquidAlphaDomain0.00.00.00.0

bsig:GlobalNonUSEquity, bsig:QuantSolutionsDomain


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value82859390
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax48.247.745.543.6
Percentage of Revenues47.146.745.243.7
Percentage of Revenues bsig:GlobalNonUSEquity bsig:QuantSolutionsDomain0.00.00.00.0

bsig:USEquity, bsig:LiquidAlphaDomain


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value20264040
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.115.019.419.5
Percentage of Revenues11.814.719.319.5
Percentage of Revenues bsig:USEquity bsig:LiquidAlphaDomain0.00.00.00.0

us-gaap:FixedIncomeFunds, bsig:LiquidAlphaDomain


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value6.16.36.66.56.46.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.63.53.43.23.12.9
Percentage of Revenues3.53.53.33.13.12.9
Percentage of Revenues us-gaap:FixedIncomeFunds bsig:LiquidAlphaDomain0.00.00.00.00.00.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

us-gaap:AssetManagement1


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value170178196205207229
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0
Percentage of Revenues97.797.899.399.4100.199.8
Percentage of Revenues us-gaap:AssetManagement10.00.00.00.00.00.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:StatementGeographical

us-gaap:AssetManagement1, country:US


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value128133148154156173
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax75.474.675.575.275.375.7
Percentage of Revenues73.772.974.974.875.475.5
Percentage of Revenues us-gaap:AssetManagement1 country:US0.00.00.00.00.00.0

us-gaap:AssetManagement1, us-gaap:NonUs


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value424548515155
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax24.625.424.524.824.724.3
Percentage of Revenues24.024.924.424.624.724.3
Percentage of Revenues us-gaap:AssetManagement1 us-gaap:NonUs0.00.00.00.00.00.0

None

us-gaap:Revenues

us-gaap:Revenues


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value174182207197207207214230233249
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:ConsolidatedEntities

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1.71.51.71.91.91.11.21.21.2
Percentage of Revenues1.00.80.81.00.90.50.60.50.5
Percentage of Revenues1.00.80.81.00.90.50.60.50.5
Percentage of Revenues bsig:ConsolidatedFunds100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:StatementBusinessSegments

bsig:AlternativesDomain


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value424137444454
Percentage of Revenues24.322.918.921.421.223.7
Percentage of Revenues24.322.918.921.421.223.7
Percentage of Revenues bsig:AlternativesDomain100.0100.0100.0100.0100.0100.0

bsig:LiquidAlphaDomain


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value4752616566717076
Percentage of Revenues27.028.829.433.032.134.332.633.4
Percentage of Revenues27.028.829.433.032.134.332.633.4
Percentage of Revenues bsig:LiquidAlphaDomain100.0100.0100.0100.0100.0100.0100.0100.0

bsig:QuantSolutionsDomain


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value828693939097
Percentage of Revenues47.447.247.145.243.742.2
Percentage of Revenues47.447.247.145.243.742.2
Percentage of Revenues bsig:QuantSolutionsDomain100.0100.0100.0100.0100.0100.0

us-gaap:Revenues us-gaap:SubsegmentsConsolidationItems

us-gaap:MaterialReconcilingItems


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value2.22.02.02.51.51.5
Percentage of Revenues1.31.11.01.20.70.7
Percentage of Revenues1.31.11.01.20.70.7
Percentage of Revenues us-gaap:MaterialReconcilingItems100.0100.0100.0100.0100.0100.0

None

us-gaap:GainLossOnInvestments us-gaap:ConsolidatedEntities

us-gaap:GainLossOnInvestments

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value6.1-23.1113.44.618-8.14.7
Percentage of GainLossOnInvestments100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues3.5-12.75.61.72.28.8-3.82.0
Percentage of Revenues bsig:ConsolidatedEntityExcludingConsolidatedFunds0.00.00.00.00.00.00.00.0

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value4.7-12.0-0.80.8-9.52.6-5.3-0.8
Percentage of GainLossOnInvestments77.051.9-6.823.5-206.514.265.4-17.0
Percentage of Revenues2.7-6.6-0.40.4-4.61.3-2.5-0.3
Percentage of Revenues bsig:ConsolidatedFunds276.5-800.0-47.142.1-500.0236.4-441.7-66.7

None

us-gaap:OtherIncome us-gaap:ConsolidatedEntities

us-gaap:OtherIncome

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2000000.01600000.01700000.01400000.01500000.01400000.02400000.01400000.03300000.0
Percentage of OtherIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues1.10.90.80.70.70.71.10.61.4
Percentage of Revenues bsig:ConsolidatedEntityExcludingConsolidatedFunds0.00.00.00.00.00.00.00.00.0

None

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value148108123145160139184216218
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues85.059.459.673.877.567.286.294.293.5

us-gaap:OperatingExpenses us-gaap:ConsolidatedEntities

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.10.10.00.20.00.20.00.30.2
Percentage of OperatingExpenses0.10.10.00.10.00.10.00.10.1
Percentage of Revenues0.10.10.00.10.00.10.00.10.1
Percentage of Revenues bsig:ConsolidatedFunds5.96.70.010.50.018.20.025.016.7

None

us-gaap:GeneralAndAdministrativeExpense us-gaap:ConsolidatedEntities

us-gaap:GeneralAndAdministrativeExpense

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value242733313132353129
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues14.015.216.216.015.015.716.613.512.7
Percentage of Revenues bsig:ConsolidatedEntityExcludingConsolidatedFunds0.00.00.00.00.00.00.00.00.0

None

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value26748351466829131525
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues15.040.640.426.222.532.813.85.86.510.3

None

us-gaap:InterestExpense us-gaap:ConsolidatedEntities

us-gaap:InterestExpense

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value7.47.88.18.38.87.06.26.36.1
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues4.24.33.94.24.23.42.92.72.6
Percentage of Revenues bsig:ConsolidatedEntityExcludingConsolidatedFunds0.00.00.00.00.00.00.00.00.0

us-gaap:InterestExpense us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value0.80.70.80.70.80.70.70.7
Percentage of InterestExpense10.89.09.98.49.111.311.111.5
Percentage of Revenues0.50.40.40.40.40.30.30.3
Percentage of Revenues us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.00.00.0

None

us-gaap:InterestIncomeExpenseNet

us-gaap:InterestIncomeExpenseNet


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-7200000.0-7500000.0-7700000.0-7900000.0-8500000.0-5900000.0-5000000.0-5400000.0
Percentage of InterestIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-4.1-4.1-3.7-4.0-4.1-2.8-2.3-2.3

us-gaap:InterestIncomeExpenseNet us-gaap:StatementBusinessSegments

us-gaap:AllOtherSegments


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value-5600000.0-5600000.0-5700000.0-6200000.0-3500000.0-3100000.0
Percentage of InterestIncomeExpenseNet77.874.772.272.959.357.4
Percentage of Revenues-3.2-3.1-2.9-3.0-1.7-1.3
Percentage of Revenues us-gaap:AllOtherSegments-5600.0-5600.0-5700.0-6200.0-3500.0-3100.0

us-gaap:InterestIncomeExpenseNet us-gaap:SubsegmentsConsolidationItems

us-gaap:MaterialReconcilingItems


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value-1600000.0-1900000.0-2200000.0-2300000.0-2400000.0-2300000.0
Percentage of InterestIncomeExpenseNet22.225.327.827.140.742.6
Percentage of Revenues-0.9-1.0-1.1-1.1-1.2-1.0
Percentage of Revenues us-gaap:MaterialReconcilingItems-72.7-95.0-110.0-92.0-160.0-153.3

None

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-31
Value3.210104.69.4
Percentage of InterestPaidNet100.0100.0100.0100.0100.0
Percentage of Revenues1.85.55.52.24.5

None

us-gaap:IncomeLossFromContinuingOperations

us-gaap:IncomeLossFromContinuingOperations


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value53227483216118542.5
Percentage of IncomeLossFromContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues30.912.135.842.010.429.58.823.51.1

None

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value61358851358234106.183
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues35.019.642.725.817.239.916.34.72.633.4

None

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value35-38.44.8-0.9-10.9145.3-2.6-9.2
Percentage of NonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues20.0-21.02.3-0.5-5.37.12.5-1.1-3.9

None

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value7.31314-32.0142116-43.43.6
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues4.27.46.9-16.26.810.47.5-18.91.5

us-gaap:IncomeTaxExpenseBenefit us-gaap:StatementBusinessSegments

us-gaap:AllOtherSegments


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value9.6-10.01212-12.415
Percentage of IncomeTaxExpenseBenefit131.5-73.5-38.486.5-57.4-35.5
Percentage of Revenues5.5-5.56.25.9-6.06.7
Percentage of Revenues us-gaap:AllOtherSegments9600.0-10000.012300.012200.0-12400.015400.0

us-gaap:IncomeTaxExpenseBenefit us-gaap:SubsegmentsConsolidationItems

us-gaap:MaterialReconcilingItems


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value-2.33.6-44.31.99.2-58.8
Percentage of IncomeTaxExpenseBenefit-31.526.5138.413.542.6135.5
Percentage of Revenues-1.32.0-22.40.94.4-25.6
Percentage of Revenues us-gaap:MaterialReconcilingItems-104.5180.0-2215.076.0613.3-3920.0

None

us-gaap:ProfitLoss

us-gaap:ProfitLoss


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value53227483216118542.5
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues30.912.135.842.010.429.58.823.61.1

us-gaap:ProfitLoss us-gaap:StatementBusinessSegments

bsig:AlternativesDomain


None
Period End2020-03-312019-09-302019-03-312018-09-30
Value108.51014
Percentage of ProfitLoss46.610.217.727.1
Percentage of Revenues5.64.35.26.4
Percentage of Revenues bsig:AlternativesDomain24.622.724.526.9

bsig:LiquidAlphaDomain


None
Period End2020-03-312019-09-302019-03-312018-09-30
Value17252629
Percentage of ProfitLoss76.930.142.654.1
Percentage of Revenues9.312.612.512.7
Percentage of Revenues bsig:LiquidAlphaDomain32.438.336.638.1

bsig:QuantSolutionsDomain


None
Period End2020-03-312019-09-302019-03-312018-09-30
Value31323036
Percentage of ProfitLoss141.238.650.466.4
Percentage of Revenues17.116.214.915.6
Percentage of Revenues bsig:QuantSolutionsDomain36.234.434.037.1

us-gaap:AllOtherSegments


None
Period End2020-03-312019-09-302019-03-312018-09-30
Value-24.2-28.1-28.4-31.2
Percentage of ProfitLoss-109.5-33.9-46.5-57.6
Percentage of Revenues-13.3-14.2-13.7-13.6
Percentage of Revenues us-gaap:AllOtherSegments-24200.0-28100.0-28400.0-31200.0

us-gaap:ProfitLoss us-gaap:SubsegmentsConsolidationItems

us-gaap:MaterialReconcilingItems


None
Period End2020-03-312019-09-302019-03-312018-09-30
Value-1.738135.2
Percentage of ProfitLoss-7.745.822.19.6
Percentage of Revenues-0.919.26.52.3
Percentage of Revenues us-gaap:MaterialReconcilingItems-85.01900.0900.0346.7

None

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value300000.0-2100000.01900000.0-800000.0-600000.0500000.0-500000.0-400000.0-1600000.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.2-1.20.9-0.4-0.30.2-0.2-0.2-0.7

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

bsig:ConsolidatedEntityExcludingConsolidatedFunds, bsig:TotalParentEntityDeficit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value300000.0-2100000.01900000.0-800000.0-600000.0500000.0-500000.0-400000.0-1600000.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.2-1.20.9-0.4-0.30.2-0.2-0.2-0.7
Percentage of Revenues bsig:ConsolidatedEntityExcludingConsolidatedFunds bsig:TotalParentEntityDeficit0.00.00.00.00.00.00.00.00.0

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:AccumulatedOtherComprehensiveIncome


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value300000.0-2100000.01900000.0-800000.0-600000.0500000.0-500000.0-400000.0-1600000.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.2-1.20.9-0.4-0.30.2-0.2-0.2-0.7
Percentage of Revenues bsig:ConsolidatedEntityExcludingConsolidatedFunds us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.0

None

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value900000.0-1600000.02500000.0-200000.001100000.0100000.0200000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.00.0100.0100.0100.0
Percentage of Revenues0.5-0.91.2-0.10.00.50.00.1

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterest


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value300000.0-2100000.01900000.0-800000.0-600000.0500000.0-500000.0-400000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax33.3131.276.0400.00.045.5-500.0-200.0
Percentage of Revenues0.2-1.20.9-0.4-0.30.2-0.2-0.2
Percentage of Revenues us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value600000.0500000.0600000.0600000.0600000.0600000.0600000.0600000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax66.7-31.224.0-300.00.054.5600.0300.0
Percentage of Revenues0.30.30.30.30.30.30.30.3
Percentage of Revenues us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest0.00.00.00.00.00.00.00.0

us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest


None
Period End2020-06-302019-06-302018-06-30
Value900000.00-1000000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.00.00.0
Percentage of Revenues0.50.0-0.4
Percentage of Revenues us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest0.00.00.0

None

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest us-gaap:ConsolidatedEntities

us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value35-10.5-6.48.4
Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest100.0100.0100.0100.0
Percentage of Revenues20.0-5.8-3.14.1
Percentage of Revenues bsig:ConsolidatedFunds2058.8-700.0-336.8763.6

None

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest


None
Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-1.6242-0.20.01.11300.2-1.0
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.00.0100.0100.0100.0100.0
Percentage of Revenues-0.9116.9-0.10.00.560.80.1-0.4

None

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value18327475286118542.154
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues10.817.935.838.113.529.58.823.50.921.9

us-gaap:NetIncomeLoss us-gaap:StatementBusinessSegments

bsig:AlternativesDomain


None
Period End2020-06-302019-06-30
Value1011
Percentage of NetIncomeLoss54.042.5
Percentage of Revenues5.85.7
Percentage of Revenues bsig:AlternativesDomain24.026.9

bsig:LiquidAlphaDomain


None
Period End2020-06-302019-06-30
Value1525
Percentage of NetIncomeLoss83.189.6
Percentage of Revenues9.012.1
Percentage of Revenues bsig:LiquidAlphaDomain33.337.7

bsig:QuantSolutionsDomain


None
Period End2020-06-302019-06-30
Value2832
Percentage of NetIncomeLoss152.4115.7
Percentage of Revenues16.515.6
Percentage of Revenues bsig:QuantSolutionsDomain34.834.6

us-gaap:AllOtherSegments


None
Period End2020-06-302019-06-30
Value-21.8-28.4
Percentage of NetIncomeLoss-115.3-101.4
Percentage of Revenues-12.5-13.7
Percentage of Revenues us-gaap:AllOtherSegments-21800.0-28400.0

us-gaap:NetIncomeLoss us-gaap:SubsegmentsConsolidationItems

us-gaap:MaterialReconcilingItems


None
Period End2020-06-302019-06-30
Value-14.0-13.0
Percentage of NetIncomeLoss-74.1-46.4
Percentage of Revenues-8.0-6.3
Percentage of Revenues us-gaap:MaterialReconcilingItems-636.4-520.0

None

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value19317075285323541.1
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues11.317.033.938.013.526.010.823.60.5

None

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value35-10.57.6-6.48.40.2
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0
Percentage of Revenues20.0-5.83.8-3.14.10.1

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest us-gaap:ConsolidatedEntities

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value35-10.56.57.6-6.48.4-4.20.20.4
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.00.0100.0100.0100.00.0100.00.0
Percentage of Revenues20.0-5.83.13.8-3.14.1-2.00.10.2
Percentage of Revenues bsig:ConsolidatedFunds2058.8-700.0382.4400.0-336.8763.6-350.016.733.3

us-gaap:NetIncomeLossAttributableToNoncontrollingInterest us-gaap:SubsegmentsConsolidationItems

us-gaap:MaterialReconcilingItems


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value35-10.57.6-6.48.40.2
Percentage of NetIncomeLossAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0
Percentage of Revenues20.0-5.83.8-3.14.10.1
Percentage of Revenues us-gaap:MaterialReconcilingItems1590.9-525.0380.0-256.0560.013.3

None

us-gaap:Assets

us-gaap:Assets


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value142214231419143214251553
Percentage of Assets100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0

us-gaap:Assets bsig:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


None
Period End2020-03-312019-12-31
Value194205
Percentage of Assets13.714.5
Percentage of Assets13.714.5
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary100.0100.0

us-gaap:Assets us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:VariableInterestEntityNotPrimaryBeneficiary


None
Period End2020-06-302019-12-31
Value64286625
Percentage of Assets451.8466.7
Percentage of Assets451.8466.7
Percentage of Assets us-gaap:VariableInterestEntityNotPrimaryBeneficiary100.0100.0

us-gaap:VariableInterestEntityPrimaryBeneficiary


None
Period End2020-06-302019-12-31
Value227205
Percentage of Assets16.014.5
Percentage of Assets16.014.5
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary100.0100.0

None

us-gaap:Liabilities

us-gaap:Liabilities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value119012291221127913211377
Percentage of Liabilities100.0100.0100.0100.0100.0100.0
Percentage of Assets83.786.486.089.392.788.7

us-gaap:Liabilities bsig:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


None
Period End2020-03-312019-12-31
Value9.96.2
Percentage of Liabilities0.80.5
Percentage of Assets0.70.4
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary5.13.0

us-gaap:Liabilities us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:VariableInterestEntityNotPrimaryBeneficiary


None
Period End2020-06-302019-12-31
Value42614320
Percentage of Liabilities358.0353.8
Percentage of Assets299.5304.3
Percentage of Assets us-gaap:VariableInterestEntityNotPrimaryBeneficiary66.365.2

us-gaap:VariableInterestEntityPrimaryBeneficiary


None
Period End2020-06-302019-12-31
Value4.26.2
Percentage of Liabilities0.40.5
Percentage of Assets0.30.4
Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary1.83.0

None

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value142214231419143214251553
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0

None

us-gaap:CashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities

us-gaap:CashAndCashEquivalentsAtCarryingValue

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value11512411111695340
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0
Percentage of Assets8.18.77.88.16.721.9
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds0.00.00.00.00.00.0

None

us-gaap:AmortizationOfIntangibleAssets

us-gaap:AmortizationOfIntangibleAssets


None
Period End2020-06-302020-03-312019-06-30
Value1900000.01600000.01700000.0
Percentage of AmortizationOfIntangibleAssets100.0100.0100.0
Percentage of Assets0.00.00.0

us-gaap:AmortizationOfIntangibleAssets us-gaap:ConsolidatedEntities

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1900000.01600000.01700000.01600000.01700000.01600000.01700000.01600000.01700000.0
Percentage of AmortizationOfIntangibleAssets100.0100.00.00.0100.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.0
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds0.00.00.00.00.00.00.00.00.0

None

us-gaap:PropertyPlantAndEquipmentNet us-gaap:ConsolidatedEntities

us-gaap:PropertyPlantAndEquipmentNet

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value706665635849
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0
Percentage of Assets5.04.74.64.44.13.2
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds0.00.00.00.00.00.0

None

us-gaap:Goodwill

us-gaap:Goodwill


None
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-31
Value258308308274308308308
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.121.721.719.30.019.90.0

us-gaap:Goodwill us-gaap:ConsolidatedEntities

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value258258274274274274
Percentage of Goodwill100.083.789.00.0100.089.0
Percentage of Assets18.118.119.319.219.317.7
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds0.00.00.00.00.00.0

us-gaap:Goodwill us-gaap:StatementBusinessSegments

bsig:Alternatives


None
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-31
Value148153153148153153153
Percentage of Goodwill57.449.649.653.949.649.649.6
Percentage of Assets10.410.810.810.40.09.90.0
Percentage of Assets bsig:Alternatives0.00.00.00.00.00.00.0

bsig:LiquidAlpha


None
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-31
Value89133133106133133133
Percentage of Goodwill34.843.243.238.743.243.243.2
Percentage of Assets6.39.49.47.50.08.60.0
Percentage of Assets bsig:LiquidAlpha0.00.00.00.00.00.00.0

bsig:QuantAndSolutions


None
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-31
Value20222220222222
Percentage of Goodwill7.97.27.27.47.27.27.2
Percentage of Assets1.41.61.61.40.01.40.0
Percentage of Assets bsig:QuantAndSolutions0.00.00.00.00.00.00.0

None

us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:ConsolidatedEntities

us-gaap:IntangibleAssetsNetExcludingGoodwill

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value616365666871
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0
Percentage of Assets4.34.54.64.74.84.6
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds0.00.00.00.00.00.0

None

us-gaap:FiniteLivedIntangibleAssetsNet

us-gaap:FiniteLivedIntangibleAssetsNet


None
Period End2020-06-302020-03-312019-12-31
Value606264
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.0
Percentage of Assets4.34.44.5

us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerRelationships


None
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-31
Value60626467697077
Percentage of FiniteLivedIntangibleAssetsNet100.0100.0100.00.00.00.00.0
Percentage of Assets4.34.44.54.70.04.60.0
Percentage of Assets us-gaap:CustomerRelationships0.00.00.00.00.00.00.0

None

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-01-01
Value10810537404344
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0
Percentage of Assets7.67.42.72.83.00.0

None

us-gaap:EquitySecuritiesFvNi us-gaap:ConsolidatedEntities

us-gaap:EquitySecuritiesFvNi

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value313744454643
Percentage of EquitySecuritiesFvNi100.0100.0100.0100.0100.0100.0
Percentage of Assets2.22.63.13.23.32.8
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds0.00.00.00.00.00.0

us-gaap:EquitySecuritiesFvNi us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:FairValueInputsLevel1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value212733353535
Percentage of EquitySecuritiesFvNi67.074.674.976.777.281.0
Percentage of Assets1.52.02.32.52.52.3
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds us-gaap:FairValueInputsLevel10.00.00.00.00.00.0

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:FairValueInputsLevel2


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value109.51110108.2
Percentage of EquitySecuritiesFvNi33.025.425.123.322.819.0
Percentage of Assets0.70.70.80.70.70.5
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds us-gaap:FairValueInputsLevel20.00.00.00.00.00.0

None

us-gaap:LongTermDebt us-gaap:CreditFacility, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:LongtermDebtType

us-gaap:LongTermDebt

us-gaap:RevolvingCreditFacility, us-gaap:FairValueInputsLevel2, us-gaap:LineOfCredit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value1302201401752100.0
Percentage of LongTermDebt100.0100.0100.0100.0100.00.0
Percentage of Assets9.115.59.912.214.70.0
Percentage of Assets us-gaap:RevolvingCreditFacility us-gaap:FairValueInputsLevel2 us-gaap:LineOfCredit0.00.00.00.00.00.0

us-gaap:LongTermDebt us-gaap:DebtInstrument, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:LongtermDebtType

bsig:NonrecourseSeedCapitalFacility, us-gaap:FairValueInputsLevel2, us-gaap:LineOfCredit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value21213535250.0
Percentage of LongTermDebt16.79.925.020.011.90.0
Percentage of Assets1.51.52.52.41.80.0
Percentage of Assets bsig:NonrecourseSeedCapitalFacility us-gaap:FairValueInputsLevel2 us-gaap:LineOfCredit0.00.00.00.00.00.0

bsig:SeniorNotes4.80due2026, us-gaap:FairValueInputsLevel2, us-gaap:SeniorNotes


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value272272272272272272
Percentage of LongTermDebt209.7123.9194.6155.6129.70.0
Percentage of Assets19.219.119.219.019.117.5
Percentage of Assets bsig:SeniorNotes4.80due2026 us-gaap:FairValueInputsLevel2 us-gaap:SeniorNotes0.00.00.00.00.00.0

bsig:SeniorNotes5.125due2031, us-gaap:FairValueInputsLevel2, us-gaap:SeniorNotes


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value121121121121121121
Percentage of LongTermDebt93.455.286.769.357.70.0
Percentage of Assets8.58.58.68.58.57.8
Percentage of Assets bsig:SeniorNotes5.125due2031 us-gaap:FairValueInputsLevel2 us-gaap:SeniorNotes0.00.00.00.00.00.0

us-gaap:LongTermDebt us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value545635568603628393
Percentage of LongTermDebt419.8288.9406.3344.9299.30.0
Percentage of Assets38.444.740.142.144.125.3
Percentage of Assets us-gaap:FairValueInputsLevel20.00.00.00.00.00.0

us-gaap:LongTermDebt us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:LongtermDebtType

us-gaap:FairValueInputsLevel2, bsig:NonrecourseSeedCapitalFacility


None
Period End2020-06-302020-03-312019-12-31
Value212135
Percentage of LongTermDebt16.79.925.0
Percentage of Assets1.51.52.5
Percentage of Assets us-gaap:FairValueInputsLevel2 bsig:NonrecourseSeedCapitalFacility0.00.00.0

us-gaap:FairValueInputsLevel2, bsig:ThirdPartyDebtArrangement


None
Period End2020-06-302020-03-312019-12-31
Value524613533
Percentage of LongTermDebt403.1279.0381.3
Percentage of Assets36.843.137.6
Percentage of Assets us-gaap:FairValueInputsLevel2 bsig:ThirdPartyDebtArrangement0.00.00.0

None

us-gaap:MinorityInterest us-gaap:ConsolidatedEntities

us-gaap:MinorityInterest

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value1.41.31.31.91.81.6
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.1
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds0.00.00.00.00.00.0

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value784948403229
Percentage of MinorityInterest5628.63776.93753.82110.51816.71831.2
Percentage of Assets5.53.43.42.82.31.9
Percentage of Assets bsig:ConsolidatedFunds0.00.00.00.00.00.0

None

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value15211911470218.4134101149172127165
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets10.78.48.14.91.50.08.60.00.00.00.00.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

bsig:ConsolidatedEntityExcludingConsolidatedFunds, bsig:ShareholdersEquityDeficit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value-410.1-428.3-452.5-511.77.0-9.7124-652.811014296-699.8
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-268.7-359.0-395.2-722.732.1-115.592.5-644.474.283.076.1-424.1
Percentage of Assets-28.8-30.1-31.9-35.70.50.08.00.00.00.00.00.0
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds bsig:ShareholdersEquityDeficit0.00.00.00.00.00.00.00.00.00.00.00.0

bsig:ConsolidatedEntityExcludingConsolidatedFunds, bsig:TotalParentEntityDeficit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value72686428-12.7-29.4103998912275164
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest47.457.856.240.7-58.3-350.077.098.660.171.359.299.4
Percentage of Assets5.14.84.52.0-0.90.06.60.00.00.00.00.0
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds bsig:TotalParentEntityDeficit0.00.00.00.00.00.00.00.00.00.00.00.0

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:AccumulatedOtherComprehensiveIncome


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value-18.2-19.1-17.5-20.0-19.8-19.8-20.9-21.0-21.2-20.2-21.6-26.3
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-11.9-16.0-15.3-28.2-90.8-235.7-15.6-20.7-14.2-11.7-17.0-15.9
Percentage of Assets-1.3-1.3-1.2-1.4-1.40.0-1.30.00.00.00.00.0
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.0

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:AdditionalPaidInCapital


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value500516534560585587764773806831890
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest328.0432.7466.6791.52684.46991.7569.7763.7541.2653.2539.4
Percentage of Assets35.236.337.639.141.10.049.20.00.00.00.0
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.0

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:NoncontrollingInterest


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value1.41.31.31.91.81.81.61.41.41.41.31.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.91.11.12.78.321.41.21.40.90.81.00.6
Percentage of Assets0.10.10.10.10.10.00.10.00.00.00.00.0
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.0

bsig:ConsolidatedFunds, us-gaap:NoncontrollingInterest


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value784948403236290.05847500.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest51.641.242.656.6150.0428.621.80.039.027.839.70.0
Percentage of Assets5.53.43.42.82.30.01.90.00.00.00.00.0
Percentage of Assets bsig:ConsolidatedFunds us-gaap:NoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterest


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value1.00.72.80.91.72.31.82.32.73.50.6
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest0.70.62.41.37.827.41.32.31.82.70.4
Percentage of Assets0.10.00.20.10.10.00.10.00.00.00.0
Percentage of Assets us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value-19.2-19.8-20.3-20.9-21.5-22.1-22.7-23.3-23.9-25.1-26.9
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-12.6-16.6-17.7-29.5-98.6-263.1-16.9-23.0-16.0-19.7-16.3
Percentage of Assets-1.3-1.4-1.4-1.5-1.50.0-1.50.00.00.00.0
Percentage of Assets us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value-18.2-19.1-17.5-20.0-19.8-19.8-20.9-21.0-21.2-20.2-21.6-26.3
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest-11.9-16.0-15.3-28.2-90.8-235.7-15.6-20.7-14.2-11.7-17.0-15.9
Percentage of Assets-1.3-1.3-1.2-1.4-1.40.0-1.30.00.00.00.00.0
Percentage of Assets us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest0.00.00.00.00.00.00.00.00.00.00.00.0

None

us-gaap:AdditionalPaidInCapital us-gaap:ConsolidatedEntities

us-gaap:AdditionalPaidInCapital

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302018-12-31
Value500516534560764
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0
Percentage of Assets35.236.337.639.149.2
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds0.00.00.00.00.0

None

us-gaap:RetainedEarningsAccumulatedDeficit us-gaap:ConsolidatedEntities

us-gaap:RetainedEarningsAccumulatedDeficit

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302018-12-31
Value-410100000.0-428300000.0-452500000.0-511700000.0-640500000.0
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0
Percentage of Assets-28.8-30.1-31.9-35.7-41.2
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds0.00.00.00.00.0

None

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:ConsolidatedEntities

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value-18200000.0-19100000.0-17500000.0-20000000.0-19800000.0-20900000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0
Percentage of Assets-1.3-1.3-1.2-1.4-1.4-1.3
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds0.00.00.00.00.00.0

None

us-gaap:MinorityInterest us-gaap:ConsolidatedEntities

us-gaap:MinorityInterest

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value1.41.31.31.91.81.6
Percentage of MinorityInterest100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.1
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds0.00.00.00.00.00.0

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value784948403229
Percentage of MinorityInterest5628.63776.93753.82110.51816.71831.2
Percentage of Assets5.53.43.42.82.31.9
Percentage of Assets bsig:ConsolidatedFunds0.00.00.00.00.00.0

None

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.51.11.10.71.23.23.51.31.6
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

bsig:ConsolidatedEntityExcludingConsolidatedFunds, bsig:TotalParentEntityDeficit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.51.11.10.71.23.23.51.31.6
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.0
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds bsig:TotalParentEntityDeficit0.00.00.00.00.00.00.00.00.0

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:AdditionalPaidInCapital


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.51.11.10.71.23.23.51.3
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.0
Percentage of Assets bsig:ConsolidatedEntityExcludingConsolidatedFunds us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.0

None

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value95-33.5458127-292.55252
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues54.7-18.321.741.013.5-141.224.422.8

None

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value7.81.3171.5-5.9-4.4-1.2-31.4
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues4.50.78.60.8-2.8-2.1-0.6-13.6

None

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-109.242-66.6-61.1-3.836-27.118
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-62.523.2-32.1-30.9-1.817.6-12.68.2

None

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-5.910-3.72118-260.42439
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-3.45.6-1.810.88.8-125.711.217.3

None

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value95-33.5458127-292.55252
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues54.7-18.321.741.013.5-141.224.422.8

None

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value18327475286118542.154
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues10.817.935.838.113.529.58.823.50.921.9

us-gaap:NetIncomeLoss us-gaap:StatementBusinessSegments

bsig:AlternativesDomain


None
Period End2020-06-302019-06-30
Value1011
Percentage of NetIncomeLoss54.042.5
Percentage of Revenues5.85.7
Percentage of Revenues bsig:AlternativesDomain24.026.9

bsig:LiquidAlphaDomain


None
Period End2020-06-302019-06-30
Value1525
Percentage of NetIncomeLoss83.189.6
Percentage of Revenues9.012.1
Percentage of Revenues bsig:LiquidAlphaDomain33.337.7

bsig:QuantSolutionsDomain


None
Period End2020-06-302019-06-30
Value2832
Percentage of NetIncomeLoss152.4115.7
Percentage of Revenues16.515.6
Percentage of Revenues bsig:QuantSolutionsDomain34.834.6

us-gaap:AllOtherSegments


None
Period End2020-06-302019-06-30
Value-21.8-28.4
Percentage of NetIncomeLoss-115.3-101.4
Percentage of Revenues-12.5-13.7
Percentage of Revenues us-gaap:AllOtherSegments-21800.0-28400.0

us-gaap:NetIncomeLoss us-gaap:SubsegmentsConsolidationItems

us-gaap:MaterialReconcilingItems


None
Period End2020-06-302019-06-30
Value-14.0-13.0
Percentage of NetIncomeLoss-74.1-46.4
Percentage of Revenues-8.0-6.3
Percentage of Revenues us-gaap:MaterialReconcilingItems-636.4-520.0

None

us-gaap:ProfitLoss

us-gaap:ProfitLoss


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value53227483216118542.5
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues30.912.135.842.010.429.58.823.61.1

us-gaap:ProfitLoss us-gaap:StatementBusinessSegments

bsig:AlternativesDomain


None
Period End2020-03-312019-09-302019-03-312018-09-30
Value108.51014
Percentage of ProfitLoss46.610.217.727.1
Percentage of Revenues5.64.35.26.4
Percentage of Revenues bsig:AlternativesDomain24.622.724.526.9

bsig:LiquidAlphaDomain


None
Period End2020-03-312019-09-302019-03-312018-09-30
Value17252629
Percentage of ProfitLoss76.930.142.654.1
Percentage of Revenues9.312.612.512.7
Percentage of Revenues bsig:LiquidAlphaDomain32.438.336.638.1

bsig:QuantSolutionsDomain


None
Period End2020-03-312019-09-302019-03-312018-09-30
Value31323036
Percentage of ProfitLoss141.238.650.466.4
Percentage of Revenues17.116.214.915.6
Percentage of Revenues bsig:QuantSolutionsDomain36.234.434.037.1

us-gaap:AllOtherSegments


None
Period End2020-03-312019-09-302019-03-312018-09-30
Value-24.2-28.1-28.4-31.2
Percentage of ProfitLoss-109.5-33.9-46.5-57.6
Percentage of Revenues-13.3-14.2-13.7-13.6
Percentage of Revenues us-gaap:AllOtherSegments-24200.0-28100.0-28400.0-31200.0

us-gaap:ProfitLoss us-gaap:SubsegmentsConsolidationItems

us-gaap:MaterialReconcilingItems


None
Period End2020-03-312019-09-302019-03-312018-09-30
Value-1.738135.2
Percentage of ProfitLoss-7.745.822.19.6
Percentage of Revenues-0.919.26.52.3
Percentage of Revenues us-gaap:MaterialReconcilingItems-85.01900.0900.0346.7

None

us-gaap:DepreciationDepletionAndAmortization us-gaap:ConsolidatedEntities

us-gaap:DepreciationDepletionAndAmortization

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value5.15.35.04.44.03.83.93.73.5
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:DeferredIncomeTaxExpenseBenefit us-gaap:ConsolidatedEntities

us-gaap:DeferredIncomeTaxExpenseBenefit

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.922181.9-0.56.23.4-7.4
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:AmortizationOfFinancingCosts us-gaap:ConsolidatedEntities

us-gaap:AmortizationOfFinancingCosts

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1000000.01100000.01100000.0900000.0800000.0900000.0900000.0800000.0
Percentage of AmortizationOfFinancingCosts100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value7.81.3171.5-5.9-4.4-1.2-31.4
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues4.50.78.60.8-2.8-2.1-0.6-13.6

None

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment us-gaap:ConsolidatedEntities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value9.46.37.29.69.87.37.26.5
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:PaymentsToAcquireInvestments us-gaap:ConsolidatedEntities

us-gaap:PaymentsToAcquireInvestments

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value5.74.8-134.6341197.0-74.1105
Percentage of PaymentsToAcquireInvestments100.0100.0100.0100.0100.0100.0100.0100.0

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value21259332
Percentage of PaymentsToAcquireInvestments368.4522.978.5467.1

None

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-109.242-66.6-61.1-3.836-27.118
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues-62.523.2-32.1-30.9-1.817.6-12.68.2

None

us-gaap:ProceedsFromIssuanceOfLongTermDebt us-gaap:ConsolidatedEntities

us-gaap:ProceedsFromIssuanceOfLongTermDebt

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value0.080220252400.0
Percentage of ProceedsFromIssuanceOfLongTermDebt0.0100.0100.0100.0100.00.0

None

us-gaap:RepaymentsOfLongTermDebt us-gaap:ConsolidatedEntities

us-gaap:RepaymentsOfLongTermDebt

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value9013245255.00.0
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.00.0

None

us-gaap:PaymentsOfDividends us-gaap:ConsolidatedEntities

us-gaap:PaymentsOfDividends

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.55.85.75.07.46.47.87.9
Percentage of PaymentsOfDividends100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:PaymentsForRepurchaseOfCommonStock us-gaap:ConsolidatedEntities

us-gaap:PaymentsForRepurchaseOfCommonStock

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value181727253.31839.134
Percentage of PaymentsForRepurchaseOfCommonStock100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value12513112112410385345321281200102
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsig:AdjustmentsToAdditionalPaidInCapitalInPermanentAndTemporaryEquitiesSharebasedCompensationRequisiteServicePeriodRecognitionValue

bsig:AdjustmentsToAdditionalPaidInCapitalInPermanentAndTemporaryEquitiesSharebasedCompensationRequisiteServicePeriodRecognitionValue


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.51.11.10.71.23.23.51.31.6
Percentage of AdjustmentsToAdditionalPaidInCapitalInPermanentAndTemporaryEquitiesSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsig:AffiliateKeyEmployeeDistributions

bsig:AffiliateKeyEmployeeDistributions


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value119.85.31213131320
Percentage of AffiliateKeyEmployeeDistributions100.0100.0100.0100.0100.0100.0100.0100.0

bsig:AffiliateKeyEmployeeDistributions us-gaap:StatementBusinessSegments

bsig:AlternativesDomain


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value6.95.85.06.45.710
Percentage of AffiliateKeyEmployeeDistributions62.759.239.746.442.549.3

bsig:LiquidAlphaDomain


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value2.83.25.16.15.86.77.08.0
Percentage of AffiliateKeyEmployeeDistributions25.532.796.248.442.050.051.139.0

bsig:QuantSolutionsDomain


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value1.30.81.51.61.02.4
Percentage of AffiliateKeyEmployeeDistributions11.88.211.911.67.511.7

bsig:AmortizationAndRevaluationOfNonCashCompensationAwards us-gaap:ConsolidatedEntities

bsig:AmortizationAndRevaluationOfNonCashCompensationAwards

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value16-44.0-19.75.113-12.73256
Percentage of AmortizationAndRevaluationOfNonCashCompensationAwards100.0100.0100.0100.0100.0100.0100.0100.0

bsig:AmortizationOfIntangibleAssetsIncludingDiscontinuedOperations us-gaap:FiniteLivedIntangibleAssetsByMajorClass

bsig:AmortizationOfIntangibleAssetsIncludingDiscontinuedOperations

us-gaap:CustomerRelationships


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value1900000.01600000.01700000.01600000.0
Percentage of AmortizationOfIntangibleAssetsIncludingDiscontinuedOperations100.0100.0100.0100.0

bsig:CapitalContributionsRedemptions

bsig:CapitalContributionsRedemptions


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-0.90.2-14.10.9-4.00.0-18.60.1-9.3
Percentage of CapitalContributionsRedemptions100.0100.0100.0100.0100.00.0100.0100.0100.0

bsig:CapitalContributionsRedemptions us-gaap:ConsolidatedEntities

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value0.81.2-1.0-37.7-0.464
Percentage of CapitalContributionsRedemptions-88.9600.0-111.1942.50.064200.0

bsig:CapitalContributionsRedemptions us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

bsig:ConsolidatedFunds, us-gaap:NoncontrollingInterest


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-0.90.2-14.10.9-4.00.0-18.618-9.3
Percentage of CapitalContributionsRedemptions100.0100.0100.0100.0100.00.0100.018600.0100.0

bsig:CapitalContributionsRedemptionsinPermanentandTemporaryEquities

bsig:CapitalContributionsRedemptionsinPermanentandTemporaryEquities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value-0.11.4-86.6-0.1-41.7-0.4-165.564-13.0
Percentage of CapitalContributionsRedemptionsinPermanentandTemporaryEquities100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsig:DividendsRedemptionsInPermanentAndTemporaryEquities

bsig:DividendsRedemptionsInPermanentAndTemporaryEquities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.78.48.68.99.29.2101011
Percentage of DividendsRedemptionsInPermanentAndTemporaryEquities100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsig:ENIOperatingExpenses

bsig:ENIOperatingExpenses


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value905264899773117139
Percentage of ENIOperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0

bsig:ENIOperatingExpenses us-gaap:StatementBusinessSegments

bsig:AlternativesDomain


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value151616151715
Percentage of ENIOperatingExpenses17.431.618.016.024.211.1

bsig:LiquidAlphaDomain


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1719181819212021
Percentage of ENIOperatingExpenses19.237.629.120.720.429.517.315.1

bsig:QuantSolutionsDomain


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value353740393937
Percentage of ENIOperatingExpenses38.770.545.740.654.627.0

us-gaap:AllOtherSegments


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value5.97.78.37.89.39.6
Percentage of ENIOperatingExpenses6.514.69.38.012.76.9

bsig:ENIOperatingExpenses us-gaap:SubsegmentsConsolidationItems

us-gaap:MaterialReconcilingItems


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value16-28.65.514-15.455
Percentage of ENIOperatingExpenses18.1-54.46.215.0-21.139.9

bsig:EarningsAfterKeyEmployeeDistributions

bsig:EarningsAfterKeyEmployeeDistributions


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value267451466813
Percentage of EarningsAfterKeyEmployeeDistributions100.0100.0100.0100.0100.0100.0

bsig:EarningsAfterKeyEmployeeDistributions us-gaap:StatementBusinessSegments

bsig:AlternativesDomain


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value10108.5111014
Percentage of EarningsAfterKeyEmployeeDistributions38.913.916.425.515.9110.5

bsig:LiquidAlphaDomain


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1517222525262629
Percentage of EarningsAfterKeyEmployeeDistributions59.922.90.048.253.938.20.0220.3

bsig:QuantSolutionsDomain


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value283132323036
Percentage of EarningsAfterKeyEmployeeDistributions109.942.161.769.545.3270.7

us-gaap:AllOtherSegments


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value-6.6-8.6-10.1-10.0-12.5-12.7
Percentage of EarningsAfterKeyEmployeeDistributions-25.2-11.6-19.5-21.5-18.4-95.5

bsig:EarningsAfterKeyEmployeeDistributions us-gaap:SubsegmentsConsolidationItems

us-gaap:MaterialReconcilingItems


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value-21.924-3.5-12.812-54.0
Percentage of EarningsAfterKeyEmployeeDistributions-83.632.7-6.7-27.519.0-406.0

bsig:EarningsBeforeVariableCompensation

bsig:EarningsBeforeVariableCompensation


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value841301421081091349691
Percentage of EarningsBeforeVariableCompensation100.0100.0100.0100.0100.0100.0100.0100.0

bsig:EarningsBeforeVariableCompensation us-gaap:StatementBusinessSegments

bsig:AlternativesDomain


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value262521282639
Percentage of EarningsBeforeVariableCompensation31.819.519.626.219.643.0

bsig:LiquidAlphaDomain


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value2932424646494955
Percentage of EarningsBeforeVariableCompensation35.225.229.643.042.636.951.261.4

bsig:QuantSolutionsDomain


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value474952545059
Percentage of EarningsBeforeVariableCompensation56.737.748.249.437.765.4

us-gaap:AllOtherSegments


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value-5.8-7.6-8.2-7.7-9.2-9.5
Percentage of EarningsBeforeVariableCompensation-6.9-5.8-7.6-7.0-6.9-10.4

bsig:EarningsBeforeVariableCompensation us-gaap:SubsegmentsConsolidationItems

us-gaap:MaterialReconcilingItems


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value-14.230-3.5-12.216-54.0
Percentage of EarningsBeforeVariableCompensation-16.823.5-3.2-11.212.6-59.3

bsig:IncreaseDecreaseInAccountsPayableAndAccrualsAndAccruedIncomeTaxes us-gaap:ConsolidatedEntities

bsig:IncreaseDecreaseInAccountsPayableAndAccrualsAndAccruedIncomeTaxes

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value9.0-16.24.0-44.07.2-17.32.2-48.1
Percentage of IncreaseDecreaseInAccountsPayableAndAccrualsAndAccruedIncomeTaxes100.0100.0100.0100.0100.0100.0100.0100.0

bsig:IncreaseDecreaseInOtherReceivablesPrepaymentsDepositsAndOtherAssets us-gaap:ConsolidatedEntities

bsig:IncreaseDecreaseInOtherReceivablesPrepaymentsDepositsAndOtherAssets

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-5.21815-3.35.56.6-3.08.1
Percentage of IncreaseDecreaseInOtherReceivablesPrepaymentsDepositsAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0

bsig:IncreaseDecreaseInReceivablesOtherAssets us-gaap:ConsolidatedEntities

bsig:IncreaseDecreaseInReceivablesOtherAssets

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-3.74.4-2.70.6-3.1-2.39.43.4
Percentage of IncreaseDecreaseInReceivablesOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0

bsig:IncreaseDecreaseinAccruedIncentiveCompensationOtherAmountsDuetoRelatedPartiesandOtherLongTermLiabilities us-gaap:ConsolidatedEntities

bsig:IncreaseDecreaseinAccruedIncentiveCompensationOtherAmountsDuetoRelatedPartiesandOtherLongTermLiabilities

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value30-70.3-2.12430-316.9-20.245
Percentage of IncreaseDecreaseinAccruedIncentiveCompensationOtherAmountsDuetoRelatedPartiesandOtherLongTermLiabilities100.0100.0100.0100.0100.0100.0100.0100.0

bsig:IncreaseDecreaseinInvestmentAdvisoryFeesReceivableandRelatedPartyReceivables us-gaap:ConsolidatedEntities

bsig:IncreaseDecreaseinInvestmentAdvisoryFeesReceivableandRelatedPartyReceivables

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-8.7-17.15.1-9.95.4-7.7-27.3-12.3
Percentage of IncreaseDecreaseinInvestmentAdvisoryFeesReceivableandRelatedPartyReceivables100.0100.0100.0100.0100.0100.0100.0100.0

bsig:InvestmentFairValueDisclosurePercentageofInvestmentHeldinCash us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel

bsig:InvestmentFairValueDisclosurePercentageofInvestmentHeldinCash

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:FairValueInputsLevel1


None
Period End2020-06-302020-03-312019-12-312019-09-30
Value-0.280.3-0.060.01
Percentage of InvestmentFairValueDisclosurePercentageofInvestmentHeldinCash100.0100.0100.0100.0

bsig:InvestmentFairValueDisclosurePercentageofInvestmentHeldinEquitySecurities us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel

bsig:InvestmentFairValueDisclosurePercentageofInvestmentHeldinEquitySecurities

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:FairValueInputsLevel1


None
Period End2020-06-302020-03-312019-12-312019-09-30
Value0.280.70.06-0.01
Percentage of InvestmentFairValueDisclosurePercentageofInvestmentHeldinEquitySecurities100.0100.0100.0100.0

bsig:NetIncomeLossAvailabletoCommonStockholdersNetofParticipatingUnvestedSecurities

bsig:NetIncomeLossAvailabletoCommonStockholdersNetofParticipatingUnvestedSecurities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value18326775285223532.1
Percentage of NetIncomeLossAvailabletoCommonStockholdersNetofParticipatingUnvestedSecurities100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsig:NetIncomeLossIncludingPortionAttributableToNoncontrollingInterestBeforeAllocationToTemporaryEquities

bsig:NetIncomeLossIncludingPortionAttributableToNoncontrollingInterestBeforeAllocationToTemporaryEquities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value47327281205923543.0
Percentage of NetIncomeLossIncludingPortionAttributableToNoncontrollingInterestBeforeAllocationToTemporaryEquities100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsig:NetIncomeLossIncludingPortionAttributableToNoncontrollingInterestBeforeAllocationToTemporaryEquities us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

bsig:ConsolidatedEntityExcludingConsolidatedFunds, bsig:ShareholdersEquityDeficit


None
Period End2020-06-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value186775285223542.1
Percentage of NetIncomeLossIncludingPortionAttributableToNoncontrollingInterestBeforeAllocationToTemporaryEquities39.693.992.1135.388.7100.0100.070.0

bsig:ConsolidatedEntityExcludingConsolidatedFunds, bsig:TotalParentEntityDeficit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value18326775285223542.1
Percentage of NetIncomeLossIncludingPortionAttributableToNoncontrollingInterestBeforeAllocationToTemporaryEquities39.699.793.992.1135.388.7100.0100.070.0

bsig:ConsolidatedFunds, us-gaap:NoncontrollingInterest


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value280.14.46.5-7.36.70.00.00.9
Percentage of NetIncomeLossIncludingPortionAttributableToNoncontrollingInterestBeforeAllocationToTemporaryEquities60.40.36.17.9-35.311.30.00.030.0

bsig:NonCashPayableForPurchaseOfSecurities us-gaap:ConsolidatedEntities

bsig:NonCashPayableForPurchaseOfSecurities

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value-0.61.1-3.47.4-15.515-9.0
Percentage of NonCashPayableForPurchaseOfSecurities100.0100.0100.0100.0100.0100.0100.0

bsig:OperatingEarningsAfterVariableCompensation

bsig:OperatingEarningsAfterVariableCompensation


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value3783896460814333
Percentage of OperatingEarningsAfterVariableCompensation100.0100.0100.0100.0100.0100.0100.0100.0

bsig:OperatingEarningsAfterVariableCompensation us-gaap:StatementBusinessSegments

bsig:AlternativesDomain


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value171613181624
Percentage of OperatingEarningsAfterVariableCompensation46.019.220.930.320.373.4

bsig:LiquidAlphaDomain


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1820273130323337
Percentage of OperatingEarningsAfterVariableCompensation49.724.131.348.251.240.278.3110.4

bsig:QuantSolutionsDomain


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value303233343138
Percentage of OperatingEarningsAfterVariableCompensation80.938.151.956.339.1113.6

us-gaap:AllOtherSegments


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value-6.6-8.6-10.1-10.0-12.5-12.7
Percentage of OperatingEarningsAfterVariableCompensation-17.7-10.3-15.7-16.6-15.4-37.6

bsig:OperatingEarningsAfterVariableCompensation us-gaap:SubsegmentsConsolidationItems

us-gaap:MaterialReconcilingItems


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value-21.924-3.5-12.812-54.0
Percentage of OperatingEarningsAfterVariableCompensation-58.928.8-5.4-21.215.8-159.8

bsig:OtherComprehensiveIncomeLossDerivativesQualifyingasHedgesAmortizationNetofTax

bsig:OtherComprehensiveIncomeLossDerivativesQualifyingasHedgesAmortizationNetofTax


None
Period End2020-03-312019-09-302019-03-312018-09-30
Value500000.0600000.0600000.0600000.0
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingasHedgesAmortizationNetofTax100.0100.0100.0100.0

bsig:OtherComprehensiveIncomeLossInPermanentAndTemporaryEquitiesForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

bsig:OtherComprehensiveIncomeLossInPermanentAndTemporaryEquitiesForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value300000.0-2100000.01900000.0-800000.0-600000.0500000.0-500000.0-400000.0-1600000.0
Percentage of OtherComprehensiveIncomeLossInPermanentAndTemporaryEquitiesForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsig:OtherIncomeExpenseReimbursement

bsig:OtherIncomeExpenseReimbursement


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1100000.01100000.01200000.0900000.01300000.01000000.01900000.01100000.02700000.0
Percentage of OtherIncomeExpenseReimbursement100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsig:PaymentsforContributionstoEquityMethodInvestees us-gaap:ConsolidatedEntities

bsig:PaymentsforContributionstoEquityMethodInvestees

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value1000000.0300000.06900000.00
Percentage of PaymentsforContributionstoEquityMethodInvestees100.0100.0100.00.0

bsig:PaymentsforNoncontrollingInterestCapitalRedeemed us-gaap:ConsolidatedEntities

bsig:PaymentsforNoncontrollingInterestCapitalRedeemed

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value400000.0-100000.03000000.00
Percentage of PaymentsforNoncontrollingInterestCapitalRedeemed100.0100.0100.00.0

bsig:PaymenttoFormerParentforRedemptionofCoinvestments us-gaap:ConsolidatedEntities

bsig:PaymenttoFormerParentforRedemptionofCoinvestments

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value300000.00005100000.00
Percentage of PaymenttoFormerParentforRedemptionofCoinvestments100.00.00.00.0100.00.0

bsig:ProceedsfromEquityMethodInvestmentDistributionAndSale us-gaap:ConsolidatedEntities

bsig:ProceedsfromEquityMethodInvestmentDistributionAndSale

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value1.30.21.21.10.010
Percentage of ProceedsfromEquityMethodInvestmentDistributionAndSale100.0100.0100.0100.00.0100.0

bsig:ProceedsfromRedeemableNoncontrollingInterestCapitalRaised us-gaap:ConsolidatedEntities

bsig:ProceedsfromRedeemableNoncontrollingInterestCapitalRaised

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-0.21.4-0.10.2370.3880.0
Percentage of ProceedsfromRedeemableNoncontrollingInterestCapitalRaised100.0100.0100.0100.0100.0100.0100.00.0

bsig:ProfitLossPermanentAndTemporaryEquities

bsig:ProfitLossPermanentAndTemporaryEquities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value53227483216118542.5
Percentage of ProfitLossPermanentAndTemporaryEquities100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsig:RedemptionOfRedeemableNonControllingInterestCapital us-gaap:ConsolidatedEntities

bsig:RedemptionOfRedeemableNonControllingInterestCapital

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value800000.001200000.0100000.0400000.0400000.0
Percentage of RedemptionOfRedeemableNonControllingInterestCapital100.00.0100.0100.0100.0100.0

bsig:SaleOfInvestmentSecuritiesandOtherInvestmentSecuritiesActivity us-gaap:ConsolidatedEntities

bsig:SaleOfInvestmentSecuritiesandOtherInvestmentSecuritiesActivity

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value23225928
Percentage of SaleOfInvestmentSecuritiesandOtherInvestmentSecuritiesActivity100.0100.0100.0100.0

bsig:StockRepurchasedDuringPeriodValuePermanentandTemporaryEquities

bsig:StockRepurchasedDuringPeriodValuePermanentandTemporaryEquities


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value161927253.3180123424
Percentage of StockRepurchasedDuringPeriodValuePermanentandTemporaryEquities100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsig:VariableCompensation

bsig:VariableCompensation


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value4746534449525357
Percentage of VariableCompensation100.0100.0100.0100.0100.0100.0100.0100.0

bsig:VariableCompensation us-gaap:StatementBusinessSegments

bsig:AlternativesDomain


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value9.79.27.8109.814
Percentage of VariableCompensation20.620.017.721.218.625.0

bsig:LiquidAlphaDomain


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1112141515161518
Percentage of VariableCompensation23.827.126.735.432.031.929.332.5

bsig:QuantSolutionsDomain


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value171718201821
Percentage of VariableCompensation37.636.942.640.835.736.9

us-gaap:AllOtherSegments


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value0.81.01.92.33.33.2
Percentage of VariableCompensation1.72.24.34.76.35.6

bsig:VariableCompensation us-gaap:SubsegmentsConsolidationItems

us-gaap:MaterialReconcilingItems


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value7.76.40.00.64.00.0
Percentage of VariableCompensation16.313.90.01.27.60.0

us-gaap:CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations

us-gaap:CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0000000100000.0
Percentage of CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations0.00.00.00.00.00.00.0100.0

us-gaap:CommonStockDividendsPerShareCashPaid

us-gaap:CommonStockDividendsPerShareCashPaid


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value0.01100000.0100000.0100000.0100000.0100000.0100000.0
Percentage of CommonStockDividendsPerShareCashPaid100.0100.0100.0100.0100.0100.0100.0

us-gaap:DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax

us-gaap:DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0000000100000.00
Percentage of DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax0.00.00.00.00.00.00.0100.00.0

us-gaap:DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax us-gaap:ConsolidatedEntities

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value000000100000.0
Percentage of DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax0.00.00.00.00.00.0100.0

us-gaap:Dividends

us-gaap:Dividends


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.78.48.68.99.29.2101011
Percentage of Dividends100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Dividends us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

bsig:ConsolidatedEntityExcludingConsolidatedFunds, bsig:ShareholdersEquityDeficit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.78.48.68.99.29.2101011
Percentage of Dividends100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsig:ConsolidatedEntityExcludingConsolidatedFunds, bsig:TotalParentEntityDeficit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value0.78.48.68.99.29.2101011
Percentage of Dividends100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EquityMethodInvestmentDividendsOrDistributions us-gaap:ConsolidatedEntities

us-gaap:EquityMethodInvestmentDividendsOrDistributions

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value-0.20.53.40.0
Percentage of EquityMethodInvestmentDividendsOrDistributions100.0100.0100.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 us-gaap:ConsolidatedEntities

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00100000.0-100000.000100000.0-300000.0-1100000.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings10.00.0100.0100.00.00.0100.0100.0100.0

us-gaap:FinitelivedIntangibleAssetsAcquired1 us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FinitelivedIntangibleAssetsAcquired1

us-gaap:TradeNames


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value01000000.001000000.0
Percentage of FinitelivedIntangibleAssetsAcquired10.0100.00.0100.0

us-gaap:GoodwillImpairmentLoss

us-gaap:GoodwillImpairmentLoss


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value0.0160.00.0
Percentage of GoodwillImpairmentLoss0.0100.00.00.0

us-gaap:GoodwillImpairmentLoss us-gaap:ConsolidatedEntities

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value0.0160.00.0
Percentage of GoodwillImpairmentLoss0.0100.00.00.0

us-gaap:GoodwillImpairmentLoss us-gaap:StatementBusinessSegments

bsig:LiquidAlpha


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value0.0160.00.0
Percentage of GoodwillImpairmentLoss0.0100.00.00.0

us-gaap:IncomeLossFromEquityMethodInvestments us-gaap:ConsolidatedEntities

us-gaap:IncomeLossFromEquityMethodInvestments

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.60.60.70.80.70.60.60.8
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxesPaid

us-gaap:IncomeTaxesPaid


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value2.40.03.09.818121712
Percentage of IncomeTaxesPaid100.00.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities us-gaap:ConsolidatedEntities

us-gaap:IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-3.81.6-3.90.2-7.83.6-7.46.6
Percentage of IncreaseDecreaseInAccountsPayableAndOtherOperatingLiabilities100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value13735.017893.0-16235.01429.038332.0199560.017093.0151000.0175580.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInterest us-gaap:ConsolidatedEntities

us-gaap:InvestmentIncomeInterest

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value200000.0300000.0400000.0400000.0300000.01100000.01200000.0900000.0600000.0
Percentage of InvestmentIncomeInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeNet

us-gaap:InvestmentIncomeNet


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value42-30.97.0-2.4202.8
Percentage of InvestmentIncomeNet100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeNet us-gaap:ConsolidatedEntities

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value35-17.27.14.7-4.513-6.6-1.1-3.3
Percentage of InvestmentIncomeNet84.455.70.067.1187.566.00.0-39.30.0

us-gaap:InvestmentIncomeNet us-gaap:ConsolidatedEntities, us-gaap:InvestmentType

bsig:ConsolidatedFunds, bsig:EquityAccountedInvestmentsInAffiliates


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value280.05.1-4.60.00.00.0
Percentage of InvestmentIncomeNet68.5-0.072.9191.70.00.00.0

bsig:ConsolidatedFunds, bsig:OtherDiscretionaryInvestments


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value6.7-17.2-0.40.113-1.1-3.3
Percentage of InvestmentIncomeNet15.955.7-5.7-4.266.0-39.30.0

us-gaap:InvestmentIncomeNet us-gaap:SubsegmentsConsolidationItems

us-gaap:MaterialReconcilingItems


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value42-30.97.0-2.4202.8
Percentage of InvestmentIncomeNet100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeNonoperating us-gaap:ConsolidatedEntities

us-gaap:InvestmentIncomeNonoperating

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value6.6-13.75.42.32.17.0-3.13.9-0.4
Percentage of InvestmentIncomeNonoperating100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeNonoperating us-gaap:ConsolidatedEntities, us-gaap:InvestmentType

bsig:ConsolidatedEntityExcludingConsolidatedFunds, bsig:EquityAccountedInvestmentsInAffiliates


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value0.60.60.80.70.60.80.7
Percentage of InvestmentIncomeNonoperating9.1-4.434.833.38.620.5-175.0

bsig:ConsolidatedEntityExcludingConsolidatedFunds, bsig:OtherDiscretionaryInvestments


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value6.0-14.31.51.46.43.1-1.1
Percentage of InvestmentIncomeNonoperating90.9104.465.266.791.479.5275.0

us-gaap:LaborAndRelatedExpense us-gaap:ConsolidatedEntities

us-gaap:LaborAndRelatedExpense

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value1165783108123101143180183
Percentage of LaborAndRelatedExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NetCashProvidedByUsedInFinancingActivitiesContinuingOperations

us-gaap:NetCashProvidedByUsedInFinancingActivitiesContinuingOperations


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-109.242-66.6-61.1-3.836-27.118
Percentage of NetCashProvidedByUsedInFinancingActivitiesContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NetCashProvidedByUsedInInvestingActivitiesContinuingOperations

us-gaap:NetCashProvidedByUsedInInvestingActivitiesContinuingOperations


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value7.81.3171.5-5.9-4.4-1.2-31.4
Percentage of NetCashProvidedByUsedInInvestingActivitiesContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NetCashProvidedByUsedInOperatingActivitiesContinuingOperations

us-gaap:NetCashProvidedByUsedInOperatingActivitiesContinuingOperations


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value95-33.5458127-292.55252
Percentage of NetCashProvidedByUsedInOperatingActivitiesContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NetCashProvidedByUsedInOperatingActivitiesContinuingOperations us-gaap:ConsolidatedEntities

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value91-29.1437970-299.565115
Percentage of NetCashProvidedByUsedInOperatingActivitiesContinuingOperations96.086.996.098.3250.9102.4125.8221.6

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value3.8-4.41.81.4-42.17.0-13.5-63.6
Percentage of NetCashProvidedByUsedInOperatingActivitiesContinuingOperations4.013.14.01.7-150.9-2.4-25.8-121.6

us-gaap:NoncontrollingInterestIncreaseFromBusinessCombination

us-gaap:NoncontrollingInterestIncreaseFromBusinessCombination


None
Period End2020-06-302019-09-302019-06-302019-03-312018-09-30
Value100000.0100000.00200000.00
Percentage of NoncontrollingInterestIncreaseFromBusinessCombination100.0100.00.0100.00.0

us-gaap:NoncontrollingInterestIncreaseFromBusinessCombination us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:NoncontrollingInterest


None
Period End2020-06-302019-09-302019-06-302019-03-312018-09-30
Value100000.0100000.00200000.00
Percentage of NoncontrollingInterestIncreaseFromBusinessCombination100.0100.00.0100.00.0

us-gaap:NumberOfReportableSegments

us-gaap:NumberOfReportableSegments


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-30
Value3.03.0003.0
Percentage of NumberOfReportableSegments100.0100.00.00.0100.0

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseCost


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-31
Value4.13.83.43.53.4
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-31
Value3.83.73.73.73.6
Percentage of OperatingLeasePayments100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax


None
Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value700000.0800000.0700000.0700000.0700000.0700000.0
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value800000.0700000.0800000.0700000.0800000.0700000.0700000.0700000.0
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax0.0100.0100.0100.00.0100.0100.0100.0

us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest


None
Period End2020-06-302019-06-302018-06-30
Value800000.0800000.0-700000.0
Percentage of OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax0.00.00.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax


None
Period End2020-03-312019-09-302019-03-312018-09-30
Value-2100000.0-800000.0500000.0-400000.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterest


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value300000.0-2100000.0-800000.0-600000.0500000.0-400000.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax0.0100.0100.00.0100.0100.0

us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest


None
Period End2020-06-302019-06-302018-06-30
Value300000.0-600000.0-1600000.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax0.00.00.0

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax


None
Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value500000.0600000.0600000.0600000.0600000.0600000.0
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

bsig:ConsolidatedEntityExcludingConsolidatedFunds, bsig:TotalParentEntityDeficit


None
Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value500000.0600000.0600000.0600000.0600000.0600000.0
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax100.0100.0100.0100.0100.0100.0

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:AccumulatedOtherComprehensiveIncome


None
Period End2020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value500000.0600000.0600000.0600000.0600000.0600000.0
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsOfDistributionsToAffiliates us-gaap:ConsolidatedEntities

us-gaap:PaymentsOfDistributionsToAffiliates

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.32.72.93.81.83.02.82.7
Percentage of PaymentsOfDistributionsToAffiliates100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleMaturityAndCollectionsOfInvestments us-gaap:ConsolidatedEntities

us-gaap:ProceedsFromSaleMaturityAndCollectionsOfInvestments

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value2412129.9
Percentage of ProceedsFromSaleMaturityAndCollectionsOfInvestments100.0100.0100.0100.0

us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:ReclassificationFromAociCurrentPeriodTax


None
Period End2020-03-312019-12-312019-09-302019-03-312018-12-312018-09-30
Value-200000.0-200000.0-100000.0-100000.0-100000.0-100000.0
Percentage of ReclassificationFromAociCurrentPeriodTax100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAociCurrentPeriodTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value-200000.0-200000.0-200000.0-100000.0-200000.0-100000.0-100000.0-100000.0
Percentage of ReclassificationFromAociCurrentPeriodTax0.0100.0100.0100.00.0100.0100.0100.0

us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest


None
Period End2020-06-302019-06-302018-06-30
Value-200000.0-200000.0-100000.0
Percentage of ReclassificationFromAociCurrentPeriodTax0.00.00.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-31
Value6.4700.10.349
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesNewIssues us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesNewIssues

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:CommonStock


None
Period End2020-06-302019-12-312019-09-302018-12-312018-09-30
Value0.10.00.00.00.0
Percentage of StockIssuedDuringPeriodSharesNewIssues100.00.00.00.00.0

us-gaap:StockRepurchasedDuringPeriodShares us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

us-gaap:StockRepurchasedDuringPeriodShares

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:CommonStock


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value2.53.22.92.80.3131.12.61.6
Percentage of StockRepurchasedDuringPeriodShares100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedDuringPeriodValue

us-gaap:StockRepurchasedDuringPeriodValue


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value161927253.3180123424
Percentage of StockRepurchasedDuringPeriodValue100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockRepurchasedDuringPeriodValue us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents

bsig:ConsolidatedEntityExcludingConsolidatedFunds, bsig:TotalParentEntityDeficit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value161927253.3180123424
Percentage of StockRepurchasedDuringPeriodValue100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:AdditionalPaidInCapital


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value161927253.31801234
Percentage of StockRepurchasedDuringPeriodValue100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TemporaryEquityNetIncome us-gaap:ConsolidatedEntities

us-gaap:TemporaryEquityNetIncome

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value6200000.0-10600000.02100000.01100000.0900000.01700000.0-4200000.0200000.0-500000.0
Percentage of TemporaryEquityNetIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStockAcquiredAverageCostPerShare

us-gaap:TreasuryStockAcquiredAverageCostPerShare


None
Period End2020-06-302019-09-302019-06-302019-03-31
Value6.569.12.3610.87
Percentage of TreasuryStockAcquiredAverageCostPerShare100.0100.0100.0100.0

us-gaap:TreasuryStockSharesAcquired

us-gaap:TreasuryStockSharesAcquired


None
Period End2020-06-302019-09-302019-06-302019-03-31
Value2.43772.787247130.303513
Percentage of TreasuryStockSharesAcquired100.0100.0100.0100.0

us-gaap:TreasuryStockValueAcquiredCostMethod

us-gaap:TreasuryStockValueAcquiredCostMethod


None
Period End2020-06-302019-09-302019-06-30
Value16253.3
Percentage of TreasuryStockValueAcquiredCostMethod100.0100.0100.0

us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic

us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-30
Value00000100000.00200000.00
Percentage of UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic0.00.00.00.00.0100.00.0100.00.0

us-gaap:VariableLeaseCost

us-gaap:VariableLeaseCost


None
Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value100000.0100000.0100000.0100000.0100000.0200000.0
Percentage of VariableLeaseCost100.0100.0100.0100.0100.0100.0

bsig:CommonStockandPreferredStockFairValueDisclosure us-gaap:ConsolidatedEntities

bsig:CommonStockandPreferredStockFairValueDisclosure

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value7.97.29.8101413
Percentage of CommonStockandPreferredStockFairValueDisclosure100.0100.0100.0100.0100.0100.0

bsig:CommonStockandPreferredStockFairValueDisclosure us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel

bsig:ConsolidatedFunds, us-gaap:FairValueInputsLevel1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value7.97.29.8101413
Percentage of CommonStockandPreferredStockFairValueDisclosure100.0100.0100.0100.0100.0100.0

bsig:DuetoFormerParentOtherObligationsCurrentandNoncurrent us-gaap:ConsolidatedEntities

bsig:DuetoFormerParentOtherObligationsCurrentandNoncurrent

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value3.43.73.73.75.233
Percentage of DuetoFormerParentOtherObligationsCurrentandNoncurrent100.0100.0100.0100.0100.0100.0

bsig:EquityAccountedInvestmentsInAffiliatesAndConsolidatedFunds

bsig:EquityAccountedInvestmentsInAffiliatesAndConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value104737356491.9
Percentage of EquityAccountedInvestmentsInAffiliatesAndConsolidatedFunds100.0100.0100.0100.0100.0100.0

bsig:FiniteLivedIntangibleAssetsAccumulatedAmortizationAndImpairment us-gaap:FiniteLivedIntangibleAssetsByMajorClass

bsig:FiniteLivedIntangibleAssetsAccumulatedAmortizationAndImpairment

us-gaap:CustomerRelationships


None
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-31
Value47454440393731
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortizationAndImpairment100.0100.0100.0100.0100.0100.0100.0

bsig:InvestmentAdvisoryFeesReceivable us-gaap:ConsolidatedEntities

bsig:InvestmentAdvisoryFeesReceivable

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value126134151146156159
Percentage of InvestmentAdvisoryFeesReceivable100.0100.0100.0100.0100.0100.0

bsig:ShorttermInvestmentFundsFairValueDisclosure us-gaap:ConsolidatedEntities

bsig:ShorttermInvestmentFundsFairValueDisclosure

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value1600000.0400000.0100000.01400000.02900000.02200000.0
Percentage of ShorttermInvestmentFundsFairValueDisclosure100.0100.0100.0100.0100.0100.0

bsig:ShorttermInvestmentFundsFairValueDisclosure us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel

bsig:ConsolidatedFunds, us-gaap:FairValueInputsLevel1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value1600000.0400000.0100000.01400000.02900000.02200000.0
Percentage of ShorttermInvestmentFundsFairValueDisclosure100.0100.0100.0100.0100.0100.0

bsig:TotalEquityIncludingTemporaryEquityCarryingAmountAttributableToNoncontrollingInterest

bsig:TotalEquityIncludingTemporaryEquityCarryingAmountAttributableToNoncontrollingInterest


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value23219319815210351176171155209171170
Percentage of TotalEquityIncludingTemporaryEquityCarryingAmountAttributableToNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

bsig:VariableInterestEntityNonconsolidatedEquityInterests bsig:InvestmentsByConsolidatedAndNonconsolidatedEntities

bsig:VariableInterestEntityNonconsolidatedEquityInterests

us-gaap:VariableInterestEntityNotPrimaryBeneficiary


None
Period End2020-03-312019-12-31
Value1517
Percentage of VariableInterestEntityNonconsolidatedEquityInterests100.0100.0

bsig:VariableInterestEntityNonconsolidatedEquityInterests us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:VariableInterestEntityNotPrimaryBeneficiary


None
Period End2020-06-302019-12-31
Value1617
Percentage of VariableInterestEntityNonconsolidatedEquityInterests0.0100.0

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent us-gaap:ConsolidatedEntities

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value332441373854
Percentage of AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value3.06.85.29.39.013
Percentage of AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent8.927.312.524.723.324.1

us-gaap:AccruedIncomeTaxes us-gaap:ConsolidatedEntities

us-gaap:AccruedIncomeTaxes

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value131212125553
Percentage of AccruedIncomeTaxes100.0100.0100.0100.0100.0100.0

us-gaap:AlternativeInvestment us-gaap:ConsolidatedEntities

us-gaap:AlternativeInvestment

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value20286.4535412
Percentage of AlternativeInvestment100.0100.0100.0100.0100.0100.0

us-gaap:AlternativeInvestment us-gaap:ConsolidatedEntities, us-gaap:InvestmentType

bsig:ConsolidatedEntityExcludingConsolidatedFunds, bsig:RealEstateFundsRedemptionRestrictions


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value6.35.96.46.29.312
Percentage of AlternativeInvestment31.320.4100.011.617.0100.0

bsig:ConsolidatedEntityExcludingConsolidatedFunds, bsig:VariousInvestments


None
Period End2020-06-302020-03-312019-12-312019-09-302018-12-31
Value2028485358
Percentage of AlternativeInvestment100.0100.0753.1100.0476.4

bsig:ConsolidatedFunds, us-gaap:OtherInvestments


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value0.00.00.00.00.038
Percentage of AlternativeInvestment0.00.00.00.00.0315.4

us-gaap:AssetsFairValueDisclosure

us-gaap:AssetsFairValueDisclosure


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value253266303322332321
Percentage of AssetsFairValueDisclosure100.0100.0100.0100.0100.0100.0

us-gaap:AssetsFairValueDisclosure us-gaap:ConsolidatedEntities

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value143158184197204196
Percentage of AssetsFairValueDisclosure56.659.660.761.461.461.2

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value110107119124128124
Percentage of AssetsFairValueDisclosure43.440.439.338.638.638.8

us-gaap:AssetsFairValueDisclosure us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:FairValueInputsLevel1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value110117122130135126
Percentage of AssetsFairValueDisclosure43.444.040.240.540.839.5

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:FairValueInputsLevel2


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value109.51110108.2
Percentage of AssetsFairValueDisclosure4.13.63.73.33.22.6

bsig:ConsolidatedFunds, us-gaap:FairValueInputsLevel1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value10.01310162221
Percentage of AssetsFairValueDisclosure3.94.93.45.16.76.8

bsig:ConsolidatedFunds, us-gaap:FairValueInputsLevel2


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value1009410910810564
Percentage of AssetsFairValueDisclosure39.435.535.933.631.919.9

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value120130132147157148
Percentage of AssetsFairValueDisclosure47.348.943.645.647.546.3

us-gaap:FairValueInputsLevel2


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value11010412011811672
Percentage of AssetsFairValueDisclosure43.639.139.636.935.122.5

us-gaap:DebtInstrumentFaceAmount

us-gaap:DebtInstrumentFaceAmount


None
Period End2020-06-302020-03-312019-09-302019-06-30
Value450450450350
Percentage of DebtInstrumentFaceAmount100.0100.0100.0100.0

us-gaap:DeferredCompensationLiabilityCurrentAndNoncurrent us-gaap:ConsolidatedEntities

us-gaap:DeferredCompensationLiabilityCurrentAndNoncurrent

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value367356404432432649
Percentage of DeferredCompensationLiabilityCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxAssetsNet us-gaap:ConsolidatedEntities

us-gaap:DeferredIncomeTaxAssetsNet

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value219220243270
Percentage of DeferredIncomeTaxAssetsNet100.0100.0100.0100.0

us-gaap:DerivativeAssets us-gaap:ConsolidatedEntities

us-gaap:DerivativeAssets

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value800000.06100000.0600000.0800000.0800000.02400000.0
Percentage of DerivativeAssets100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssets us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel

bsig:ConsolidatedFunds, us-gaap:FairValueInputsLevel1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value500000.05400000.0500000.0500000.0700000.02200000.0
Percentage of DerivativeAssets62.588.583.362.587.591.7

bsig:ConsolidatedFunds, us-gaap:FairValueInputsLevel2


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value300000.0700000.0100000.0300000.0100000.0200000.0
Percentage of DerivativeAssets37.511.516.737.512.58.3

us-gaap:DerivativeLiabilities us-gaap:ConsolidatedEntities

us-gaap:DerivativeLiabilities

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value1200000.03100000.0400000.0700000.01600000.0900000.0
Percentage of DerivativeLiabilities100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeLiabilities us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel

bsig:ConsolidatedFunds, us-gaap:FairValueInputsLevel1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value1100000.02600000.0100000.0600000.01400000.0800000.0
Percentage of DerivativeLiabilities91.783.925.085.787.588.9

bsig:ConsolidatedFunds, us-gaap:FairValueInputsLevel2


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value100000.0500000.0300000.0100000.0200000.0100000.0
Percentage of DerivativeLiabilities8.316.175.014.312.511.1

us-gaap:EmployeeRelatedLiabilitiesCurrentAndNoncurrent us-gaap:ConsolidatedEntities

us-gaap:EmployeeRelatedLiabilitiesCurrentAndNoncurrent

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value946313713098171
Percentage of EmployeeRelatedLiabilitiesCurrentAndNoncurrent100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue us-gaap:ConsolidatedEntities

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value3.03.03.03.03.03.03.04.65.26.30.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:FinancialInstrumentsSoldNotYetPurchasedAtFairValue us-gaap:ConsolidatedEntities

us-gaap:FinancialInstrumentsSoldNotYetPurchasedAtFairValue

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value1200000.03100000.0900000.01600000.01600000.01700000.0
Percentage of FinancialInstrumentsSoldNotYetPurchasedAtFairValue100.0100.0100.0100.0100.0100.0

us-gaap:FinancialLiabilitiesFairValueDisclosure

us-gaap:FinancialLiabilitiesFairValueDisclosure


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value1200000.03100000.0900000.01600000.01600000.01700000.0
Percentage of FinancialLiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0

us-gaap:FinancialLiabilitiesFairValueDisclosure us-gaap:ConsolidatedEntities

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value1200000.03100000.0900000.01600000.01600000.01700000.0
Percentage of FinancialLiabilitiesFairValueDisclosure100.0100.0100.0100.0100.0100.0

us-gaap:FinancialLiabilitiesFairValueDisclosure us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel

bsig:ConsolidatedFunds, us-gaap:FairValueInputsLevel1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value1100000.02600000.0600000.01500000.01400000.01600000.0
Percentage of FinancialLiabilitiesFairValueDisclosure91.783.966.793.887.594.1

bsig:ConsolidatedFunds, us-gaap:FairValueInputsLevel2


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value100000.0500000.0300000.0100000.0200000.0100000.0
Percentage of FinancialLiabilitiesFairValueDisclosure8.316.133.36.212.55.9

us-gaap:FinancialLiabilitiesFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value1100000.02600000.0600000.01500000.01400000.01600000.0
Percentage of FinancialLiabilitiesFairValueDisclosure91.783.966.793.887.594.1

us-gaap:FairValueInputsLevel2


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value100000.0500000.0300000.0100000.0200000.0100000.0
Percentage of FinancialLiabilitiesFairValueDisclosure8.316.133.36.212.55.9

us-gaap:GoodwillGross

us-gaap:GoodwillGross


None
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-31
Value308258274308274274274
Percentage of GoodwillGross100.0100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillGross us-gaap:StatementBusinessSegments

bsig:Alternatives


None
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-31
Value153148148153148148148
Percentage of GoodwillGross49.657.453.949.653.953.953.9

bsig:LiquidAlpha


None
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-31
Value13389106133106106106
Percentage of GoodwillGross43.234.838.743.238.738.738.7

bsig:QuantAndSolutions


None
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-31
Value22202022202020
Percentage of GoodwillGross7.27.97.47.27.47.47.4

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss


None
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-31
Value50503333333333
Percentage of GoodwillImpairedAccumulatedImpairmentLoss100.0100.0100.0100.0100.0100.0100.0

us-gaap:GoodwillImpairedAccumulatedImpairmentLoss us-gaap:StatementBusinessSegments

bsig:LiquidAlpha


None
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-31
Value43432727272727
Percentage of GoodwillImpairedAccumulatedImpairmentLoss86.586.579.979.979.979.979.9

us-gaap:IncomeTaxReceivable us-gaap:ConsolidatedEntities

us-gaap:IncomeTaxReceivable

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value28362612113.9
Percentage of IncomeTaxReceivable100.0100.0100.0100.0100.0100.0

us-gaap:Investments

us-gaap:Investments


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value357339376378381323
Percentage of Investments100.0100.0100.0100.0100.0100.0

us-gaap:Investments us-gaap:ConsolidatedEntities

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value145161186199206198
Percentage of Investments40.647.449.452.754.061.4

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value212178190179175124
Percentage of Investments59.452.650.647.346.038.6

us-gaap:InvestmentsFairValueDisclosure

us-gaap:InvestmentsFairValueDisclosure


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value253266303322332321
Percentage of InvestmentsFairValueDisclosure100.0100.0100.0100.0100.0100.0

us-gaap:InvestmentsFairValueDisclosure bsig:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


None
Period End2020-03-312019-12-31
Value107119
Percentage of InvestmentsFairValueDisclosure40.439.3

us-gaap:InvestmentsFairValueDisclosure us-gaap:ConsolidatedEntities

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value110107119124128124
Percentage of InvestmentsFairValueDisclosure43.440.439.338.638.638.8

us-gaap:InvestmentsFairValueDisclosure us-gaap:ConsolidatedEntities, us-gaap:InvestmentType

bsig:ConsolidatedEntityExcludingConsolidatedFunds, bsig:InvestmentsOfVoluntaryDeferredCompensationPlans


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value888988959991
Percentage of InvestmentsFairValueDisclosure35.133.529.229.630.028.6

bsig:ConsolidatedEntityExcludingConsolidatedFunds, bsig:OtherDiscretionaryInvestments


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value546995102104104
Percentage of InvestmentsFairValueDisclosure21.526.031.431.831.432.6

bsig:ConsolidatedEntityExcludingConsolidatedFunds, bsig:VariousInvestments


None
Period End2020-06-302020-03-312019-12-312019-09-302018-12-31
Value2331515661
Percentage of InvestmentsFairValueDisclosure9.112.016.917.519.2

us-gaap:InvestmentsFairValueDisclosure us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


None
Period End2020-06-302019-12-31
Value110119
Percentage of InvestmentsFairValueDisclosure43.439.3

us-gaap:LineOfCredit us-gaap:ConsolidatedEntities

us-gaap:LineOfCredit

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value524613533568603393
Percentage of LineOfCredit100.0100.0100.0100.0100.0100.0

us-gaap:LoansAndLeasesReceivableRelatedParties us-gaap:RelatedPartyTransaction, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:LoansAndLeasesReceivableRelatedParties

bsig:AffiliateLoantoItsEmployees, bsig:AffiliateEmployees


None
Period End2020-03-312019-12-31
Value1416
Percentage of LoansAndLeasesReceivableRelatedParties100.0100.0

us-gaap:LoansReceivableFairValueDisclosure us-gaap:ConsolidatedEntities

us-gaap:LoansReceivableFairValueDisclosure

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value999310910710463
Percentage of LoansReceivableFairValueDisclosure100.0100.0100.0100.0100.0100.0

us-gaap:LoansReceivableFairValueDisclosure us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel

bsig:ConsolidatedFunds, us-gaap:FairValueInputsLevel2


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value999310910710463
Percentage of LoansReceivableFairValueDisclosure100.0100.0100.0100.0100.0100.0

us-gaap:LongTermDebtFairValue us-gaap:CreditFacility, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:LongtermDebtType

us-gaap:LongTermDebtFairValue

us-gaap:RevolvingCreditFacility, us-gaap:FairValueInputsLevel2, us-gaap:LineOfCredit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value1302201401752100.0
Percentage of LongTermDebtFairValue100.0100.0100.0100.0100.00.0

us-gaap:LongTermDebtFairValue us-gaap:DebtInstrument, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:LongtermDebtType

bsig:NonrecourseSeedCapitalFacility, us-gaap:FairValueInputsLevel2, us-gaap:LineOfCredit


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value21213535250.0
Percentage of LongTermDebtFairValue16.79.925.020.011.90.0

bsig:SeniorNotes4.80due2026, us-gaap:FairValueInputsLevel2, us-gaap:SeniorNotes


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value273245287285278266
Percentage of LongTermDebtFairValue210.6111.7205.1163.4132.50.0

bsig:SeniorNotes5.125due2031, us-gaap:FairValueInputsLevel2, us-gaap:SeniorNotes


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value12188126124123102
Percentage of LongTermDebtFairValue93.140.090.371.058.60.0

us-gaap:LongTermDebtFairValue us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value546575588620636368
Percentage of LongTermDebtFairValue420.4261.6420.4354.4303.00.0

us-gaap:LongTermDebtFairValue us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:LongtermDebtType

us-gaap:FairValueInputsLevel2, bsig:NonrecourseSeedCapitalFacility


None
Period End2020-06-302020-03-312019-12-31
Value212135
Percentage of LongTermDebtFairValue16.79.925.0

us-gaap:FairValueInputsLevel2, bsig:ThirdPartyDebtArrangement


None
Period End2020-06-302020-03-312019-12-31
Value524553553
Percentage of LongTermDebtFairValue403.7251.7395.4

us-gaap:NonRecourseDebt us-gaap:ConsolidatedEntities

us-gaap:NonRecourseDebt

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value21213535250.0
Percentage of NonRecourseDebt100.0100.0100.0100.0100.00.0

us-gaap:NotesReceivableRelatedParties us-gaap:RelatedPartyTransaction, us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:NotesReceivableRelatedParties

bsig:AffiliateLoantoItsEmployees, bsig:AffiliateEmployees


None
Period End2020-06-302019-12-31
Value1116
Percentage of NotesReceivableRelatedParties100.0100.0

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-01-01
Value12411942454849
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


None
Period End2020-06-302020-03-312019-06-302019-03-31
Value0.03470.03480.04110.0397
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0100.0100.0100.0

us-gaap:OtherAssets bsig:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:OtherAssets

us-gaap:VariableInterestEntityPrimaryBeneficiary


None
Period End2020-03-312019-12-31
Value8785
Percentage of OtherAssets100.0100.0

us-gaap:OtherAssets us-gaap:ConsolidatedEntities

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value605789929841
Percentage of OtherAssets0.066.3104.70.00.00.0

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value5.79.34.9109.514
Percentage of OtherAssets0.010.75.70.00.00.0

us-gaap:OtherAssets us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


None
Period End2020-06-302019-12-31
Value11785
Percentage of OtherAssets0.0100.0

us-gaap:OtherLiabilities bsig:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:OtherLiabilities

us-gaap:VariableInterestEntityPrimaryBeneficiary


None
Period End2020-03-312019-12-31
Value9.96.2
Percentage of OtherLiabilities100.0100.0

us-gaap:OtherLiabilities us-gaap:ConsolidatedEntities

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value3.33.14548528.3
Percentage of OtherLiabilities0.031.3735.50.00.00.0

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value0.00.00.10.00.00.1
Percentage of OtherLiabilities0.00.01.60.00.00.0

us-gaap:OtherLiabilities us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:VariableInterestEntityPrimaryBeneficiary


None
Period End2020-06-302019-12-31
Value4.26.2
Percentage of OtherLiabilities0.0100.0

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount us-gaap:ConsolidatedEntities

us-gaap:RedeemableNoncontrollingInterestEquityCarryingAmount

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value797483818141
Percentage of RedeemableNoncontrollingInterestEquityCarryingAmount100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue us-gaap:ConsolidatedEntities

us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value9500000.06800000.09700000.08200000.07400000.04900000.0
Percentage of RestrictedCashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0

us-gaap:TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests us-gaap:ConsolidatedEntities

us-gaap:TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests

bsig:ConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-31
Value79748381814341706.037445.5
Percentage of TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TradingSecuritiesDebt us-gaap:ConsolidatedEntities

us-gaap:TradingSecuritiesDebt

bsig:ConsolidatedEntityExcludingConsolidatedFunds


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value888988959991
Percentage of TradingSecuritiesDebt100.0100.0100.0100.0100.0100.0

us-gaap:TradingSecuritiesDebt us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel

bsig:ConsolidatedEntityExcludingConsolidatedFunds, us-gaap:FairValueInputsLevel1


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value888988959991
Percentage of TradingSecuritiesDebt100.0100.0100.0100.0100.0100.0

us-gaap:VariableInterestEntityEntityMaximumLossExposureAmount bsig:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:VariableInterestEntityEntityMaximumLossExposureAmount

us-gaap:VariableInterestEntityNotPrimaryBeneficiary


None
Period End2020-03-312019-12-31
Value2123
Percentage of VariableInterestEntityEntityMaximumLossExposureAmount100.0100.0

us-gaap:VariableInterestEntityEntityMaximumLossExposureAmount us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:VariableInterestEntityNotPrimaryBeneficiary


None
Period End2020-06-302019-12-31
Value2323
Percentage of VariableInterestEntityEntityMaximumLossExposureAmount0.0100.0

us-gaap:VariableInterestEntityNonconsolidatedCarryingAmountAssets bsig:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:VariableInterestEntityNonconsolidatedCarryingAmountAssets

us-gaap:VariableInterestEntityNotPrimaryBeneficiary


None
Period End2020-03-312019-12-31
Value63116625
Percentage of VariableInterestEntityNonconsolidatedCarryingAmountAssets100.0100.0

us-gaap:VariableInterestEntityNonconsolidatedCarryingAmountLiabilities bsig:InvestmentsByConsolidatedAndNonconsolidatedEntities

us-gaap:VariableInterestEntityNonconsolidatedCarryingAmountLiabilities

us-gaap:VariableInterestEntityNotPrimaryBeneficiary


None
Period End2020-03-312019-12-31
Value42014320
Percentage of VariableInterestEntityNonconsolidatedCarryingAmountLiabilities100.0100.0

Line plots across dimensions of each concept


us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidatedEntities, us-gaap:ProductOrService
('bsig:ConsolidatedEntityExcludingConsolidatedFunds', None)
None
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:InvestmentType, us-gaap:StatementBusinessSegments
(None, 'bsig:LiquidAlphaDomain')
None
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService, us-gaap:StatementGeographical
('us-gaap:AssetManagement1', None)
None
us-gaap:Revenues
us-gaap:StatementBusinessSegments
(None,)
None
us-gaap:GainLossOnInvestments
us-gaap:ConsolidatedEntities
(None,)
None
us-gaap:ProfitLoss
us-gaap:StatementBusinessSegments
(None,)
None
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents
('bsig:ConsolidatedEntityExcludingConsolidatedFunds', None)
None
us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents
(None,)
None
us-gaap:NetIncomeLoss
us-gaap:StatementBusinessSegments
(None,)
None
us-gaap:Assets
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
(None,)
None
us-gaap:Liabilities
us-gaap:InvestmentsByConsolidatedAndNonconsolidatedEntities
(None,)
None
us-gaap:Goodwill
us-gaap:StatementBusinessSegments
(None,)
None
us-gaap:EquitySecuritiesFvNi
us-gaap:ConsolidatedEntities, us-gaap:FairValueByFairValueHierarchyLevel
('bsig:ConsolidatedEntityExcludingConsolidatedFunds', None)
None
us-gaap:LongTermDebt
us-gaap:DebtInstrument, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:LongtermDebtType
(None, 'us-gaap:FairValueInputsLevel2', 'us-gaap:SeniorNotes')
None
us-gaap:LongTermDebt
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:LongtermDebtType
('us-gaap:FairValueInputsLevel2', None)
None
us-gaap:MinorityInterest
us-gaap:ConsolidatedEntities
(None,)
None
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents
('bsig:ConsolidatedEntityExcludingConsolidatedFunds', None)
None
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents
(None, 'us-gaap:NoncontrollingInterest')
None
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
us-gaap:StatementEquityComponents
(None,)
None
us-gaap:MinorityInterest
us-gaap:ConsolidatedEntities
(None,)
None
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:ConsolidatedEntities, us-gaap:StatementEquityComponents
('bsig:ConsolidatedEntityExcludingConsolidatedFunds', None)
None
us-gaap:NetIncomeLoss
us-gaap:StatementBusinessSegments
(None,)
None
us-gaap:ProfitLoss
us-gaap:StatementBusinessSegments
(None,)
None
us-gaap:PaymentsToAcquireInvestments
us-gaap:ConsolidatedEntities
(None,)
None