OEC


Line plots across dimensions of each concept
Tables

Table of contents



us-gaap:CommonStockValue

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesAuthorized

us-gaap:CommonStockSharesOutstanding
us-gaap:StatementEquityComponents

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:CostOfGoodsAndServicesSold

us-gaap:GrossProfit

us-gaap:ResearchAndDevelopmentExpense

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:InterestExpense
us-gaap:ConsolidationItems

us-gaap:InterestPaidNet
us-gaap:ConsolidationItems
us-gaap:OtherNonoperatingIncomeExpense

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:ConsolidationItems
us-gaap:IncomeStatementLocation
us-gaap:PlanName
us-gaap:ConsolidationItems
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:NonoperatingIncomeExpense
us-gaap:ConsolidationItems
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:IncomeTaxExpenseBenefit
us-gaap:ConsolidationItems
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:IncomeTaxesPaidNet

us-gaap:NetIncomeLoss
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:StatementEquityComponents

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:Assets

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:AccountsReceivableNetCurrent

us-gaap:InventoryNet

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:AssetsNoncurrent

us-gaap:Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:LiabilitiesCurrent

us-gaap:DebtCurrent

us-gaap:LongTermDebtCurrent

us-gaap:AccountsPayableCurrent

us-gaap:TaxesPayableCurrent

us-gaap:AccruedLiabilitiesCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherLiabilitiesCurrent

us-gaap:LiabilitiesNoncurrent
us-gaap:CreditFacility, us-gaap:DebtInstrument
us-gaap:LongTermDebt

us-gaap:LongTermDebtNoncurrent
us-gaap:CreditFacility, us-gaap:DebtInstrument
us-gaap:DeferredFinanceCostsNoncurrentNet

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapital

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:TreasuryStockValue

us-gaap:StockIssuedDuringPeriodValueNewIssues
us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementEquityComponents

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:StatementEquityComponents

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInInventories

us-gaap:ShareBasedCompensation

us-gaap:AmortizationOfFinancingCosts
us-gaap:CreditFacility
us-gaap:CreditFacility, us-gaap:DebtInstrument

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:RepaymentsOfLongTermDebt

us-gaap:PaymentsOfDividends

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

oec:AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslation

oec:ActuarialGainLossRecognizedInEarnings

oec:AdjustedEarningsBeforeInterestTaxDepreciationandAmortization
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

oec:CashInflowsRelatedToCurrentFinancialLiabilitiesFinancingActivities

oec:CashOutflowsRelatedToCurrentFinancialLiabilitiesFinancingActivities

oec:CorporateCharges
us-gaap:ConsolidationItems
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:VariableRate
oec:DebtInstrumentFloorOfVariableRateBasis

oec:DepreciationAmortizationAndAssetImpairment
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

oec:EffectiveIncomeTaxRateReconciliationNetDiscreteTaxExpenseAmount
us-gaap:ConsolidationItems
oec:EnvironmentalProtectionAgencyRelatedExpense
us-gaap:ConsolidationItems
oec:ExtraordinaryExpenseItemsRelatedToCOVID19

oec:FinanceLeaseCost

oec:IncreaseDecreaseInProvisions

oec:InventoryReservePeriodChange

oec:NumberOfFacilitiesOwned
us-gaap:StatementGeographical
us-gaap:RelatedPartyTransactionsByRelatedParty
oec:NumberOfRelatedParties

oec:OperatingLeaseLiabilityPeriodIncreaseDecreaseCurrent

oec:OperatingLeaseLiabilityPeriodIncreaseDecreaseNoncurrent

oec:PensionObligationsActuarialLossesAsAPercentageOfDefinedBenefitObligations

oec:ReclassificationFromAOCICurrentPeriodForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
us-gaap:StatementEquityComponents

oec:RestructuringSettlementAndImpairmentProvisionsNet
us-gaap:AwardType, us-gaap:PlanName
oec:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod
us-gaap:AwardType
oec:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceBasedAdjustment
us-gaap:AwardType, us-gaap:PlanName
us-gaap:AwardType
oec:ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsSettledInPeriod
us-gaap:AwardType, us-gaap:PlanName
us-gaap:AwardType, us-gaap:PlanName
oec:SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsCorrelation
us-gaap:AwardType, us-gaap:PlanName
oec:SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateOEC
us-gaap:AwardType, us-gaap:PlanName
oec:SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsExpectedVolatilityRatePeerGroup

us-gaap:AllowanceForDoubtfulAccountsReceivableRecoveries

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect

us-gaap:CommonStockDividendsPerShareDeclared
us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:StatementBusinessSegments
us-gaap:ConcentrationRiskPercentage1
us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:VariableRate
us-gaap:DebtInstrumentBasisSpreadOnVariableRate1
us-gaap:CreditFacility, us-gaap:VariableRate
us-gaap:StatementScenario, us-gaap:CreditFacility, us-gaap:VariableRate

us-gaap:DeferredIncomeTaxesAndTaxCredits

us-gaap:DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:DividendsCommonStock
us-gaap:StatementEquityComponents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

us-gaap:IncomeLossFromEquityMethodInvestments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance

us-gaap:IncreaseDecreaseInAccountsPayableTrade

us-gaap:IncreaseDecreaseInAccruedTaxesPayable

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InventoryWriteDown

us-gaap:LeaseCost

us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeasePayments

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent

us-gaap:OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAfterAdjustmentsAndTaxParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherCostAndExpenseOperating

us-gaap:OtherNoncashIncomeExpense

us-gaap:PaymentsForRestructuring
us-gaap:RestructuringCostAndReserve

us-gaap:PaymentsOfDebtIssuanceCosts

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsToAcquireProductiveAssets
us-gaap:ConsolidationItems
us-gaap:ProfessionalFees

us-gaap:ProvisionForDoubtfulAccounts

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:ReclassificationFromAociCurrentPeriodTax
us-gaap:StatementEquityComponents
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:RelatedPartyTransactionPurchasesFromRelatedParty

us-gaap:RestructuringReserveTranslationAdjustment
us-gaap:RestructuringCostAndReserve

us-gaap:RestructuringSettlementAndImpairmentProvisions
us-gaap:ConsolidationItems
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:RevenueFromRelatedParties

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
us-gaap:AwardType, us-gaap:GranteeStatus, us-gaap:PlanName
us-gaap:AwardType, us-gaap:PlanName
us-gaap:AwardType, us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
us-gaap:AwardType, us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
us-gaap:AwardType, us-gaap:GranteeStatus, us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType, us-gaap:PlanName
us-gaap:AwardType, us-gaap:Vesting
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesNewIssues
us-gaap:CreditFacility
oec:DebtInstrumentCovenantLeverageRatio
us-gaap:Range, us-gaap:CreditFacility

oec:GuaranteeObligationsCarryingAmount
us-gaap:CounterpartyName

oec:LesseeOperatingAndFinanceLeasesLiabilityUndiscountedExcessAmount
us-gaap:StatementGeographical
oec:LesseeOperatingLeaseLeaseNotYetCommencedUndiscountedAmount
us-gaap:CreditFacility, us-gaap:DebtInstrument
oec:LongTermDebtGrossCurrent
us-gaap:CreditFacility, us-gaap:DebtInstrument
oec:LongtermDebtExcludingCurrentMaturitiesGross
us-gaap:CounterpartyName
oec:NumberOfGuaranteesIssuedByCounterparty

oec:OperatingAndFinanceLeaseLiability

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDue

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDueInFiveYears

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDueInFourYears

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDueInThreeYears

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDueInTwoYears

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDueNextTwelveMonths

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDueThereafter

oec:OtherFinancialAssetsCurrent

oec:OtherFinancialAssetsNoncurrent

oec:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization

oec:PurchaseObligationDueInSecondThroughFifthYear
us-gaap:AwardType
oec:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedToVestNumber
us-gaap:AwardType, us-gaap:GranteeStatus, us-gaap:PlanName
us-gaap:AwardType, us-gaap:PlanName

us-gaap:AccountsReceivableGrossCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
us-gaap:CreditFacility, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DebtInstrumentFairValue
us-gaap:CreditFacility
us-gaap:DebtIssuanceCostsLineOfCreditArrangementsNet

us-gaap:DebtLongtermAndShorttermCombinedAmount
us-gaap:CreditFacility, us-gaap:DebtInstrument
us-gaap:DeferredFinanceCostsCurrentNet
us-gaap:CreditFacility, us-gaap:DebtInstrument
us-gaap:DeferredFinanceCostsNet

us-gaap:DeferredIncomeTaxAssetsNet
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DerivativeAssets
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DerivativeAssetsCurrent
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DerivativeAssetsNoncurrent
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DerivativeLiabilities
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DerivativeLiabilitiesCurrent
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DerivativeLiabilitiesNoncurrent
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:DueFromRelatedParties
us-gaap:RelatedPartyTransactionsByRelatedParty
us-gaap:DueToRelatedPartiesCurrentAndNoncurrent

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions

us-gaap:EquityMethodInvestments

us-gaap:IncomeTaxesReceivable

us-gaap:InventoryFinishedGoodsNetOfReserves

us-gaap:InventoryRawMaterialsNetOfReserves

us-gaap:InventoryValuationReserves

us-gaap:InventoryWorkInProcessNetOfReserves
us-gaap:CounterpartyName, us-gaap:CreditFacility
us-gaap:LineOfCredit
us-gaap:CreditFacility
us-gaap:CounterpartyName, us-gaap:CreditFacility
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization

us-gaap:PurchaseObligation

us-gaap:PurchaseObligationDueInNextTwelveMonths

us-gaap:RestrictedCash

us-gaap:RestructuringReserve
us-gaap:RestructuringCostAndReserve
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedIntrinsicValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
us-gaap:AwardType, us-gaap:GranteeStatus, us-gaap:PlanName
us-gaap:AwardType, us-gaap:PlanName
us-gaap:AwardType
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding

us-gaap:ShortTermBorrowings
us-gaap:StatementGeographical, us-gaap:CreditFacility

us-gaap:TreasuryStockShares

Tables

  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:CommonStockValue ███▁85.32385.32385.32385.032NANANA84.254NANANA
us-gaap:CommonStockSharesIssued NA60.99225960.99225960.729289NANANA60.035579NANANA
us-gaap:CommonStockSharesAuthorized NA65.03557965.03557965.035579NANANA89.452626NANANA
us-gaap:CommonStockSharesOutstanding NA60.48711760.48711760.224147NANANA59.518498NANANA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStockNA60.48711760.48711760.224147NA60.21220859.51849859.518498NANANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding ▁▁█61.25961.26361.391NA61.45361.12561.113NANANANA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic ██▁60.48760.48760.276NA60.21259.98459.518NANANANA
us-gaap:EarningsPerShareBasic ▄▁▅▅▅▅▅▄▅█▅0.15-0.30.30.320.40.410.320.270.430.890.45
us-gaap:EarningsPerShareDiluted ▄▁▄▅▅▅▅▄▅█▅0.15-0.290.290.310.390.40.320.250.430.870.44
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,oec:Rubber▄▁▆▆▇██178.406108.261216.228207.669247.371259.731253.128NANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,oec:Specialties▂▁▅▄▅█▇103.6394.388119.779114.759122.824139.285131.586NANANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▄▁▆▅▇█▇▇█▇█282.036202.648336.007322.428370.195399.016384.714385.964393.954391.586406.699
us-gaap:CostOfGoodsAndServicesSold ▃▁▅▅▇██202.854168.704245.815233.44271.481294.978286.745NANANANA
us-gaap:GrossProfit ▅▁▆▆▇▇▇▆███79.18233.94490.19388.98798.714104.03897.96995.639109.156112.773112.403
us-gaap:ResearchAndDevelopmentExpense █▁▂▂▂▂▃7.3524.4494.9565.0384.7934.9145.129NANANANA
us-gaap:SellingGeneralAndAdministrativeExpense ▃▁▃▆▆▇█43.15538.54744.51949.55649.63652.11755.577NANANANA
us-gaap:OperatingIncomeLoss ▄▁▅▄▅▅▄▄▅█▅24.147-12.87937.54332.59638.38641.4734.69926.67241.84382.45745.333
us-gaap:InterestExpense █▄▆▂▁▃▁10.7698.2779.617.0636.57.5666.443NANANANA
us-gaap:InterestPaidNet ▅▅▃▄█▁▇5.2465.1614.3454.7066.5273.1426.024NANANANA
us-gaap:AllocatedShareBasedCompensationExpense ▄▄▁▆▆▅█1.1821.199-1.1392.3012.0251.5593.553NANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments ▄▁▅▅▅▅▅▄▅█▅11.106-23.8125.53425.53331.88633.90428.25621.37935.65373.6836.951
us-gaap:NonoperatingIncomeExpense █▁▆-2.272-2.654-2.398NANA0.00.0NANANANA
 us-gaap:NonoperatingIncomeExpense us-gaap:ConsolidationItems us-gaap:CorporateNonSegment█▁▆-2.272-2.654-2.398NANANANANANANANA
 us-gaap:NonoperatingIncomeExpense us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:StatementEquityComponents us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossNANA2.4NANANA0.0NANANANA
us-gaap:IncomeTaxExpenseBenefit ▅▁▇▇▇██2.25-5.8797.6356.7017.7679.3099.439NANANANA
us-gaap:IncomeTaxesPaidNet ▁█-1.0682.26NA7.931-1.7059.116NANANANANA
us-gaap:NetIncomeLoss ▄▁▅▅▅▅▅▄▅█▅8.997-17.7818.03218.96524.25324.74818.95415.65825.81753.08126.754
us-gaap:ComprehensiveIncomeNetOfTax ▅▁▃██▇█5.168-17.195-4.81119.49518.95315.49318.245NANANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:Assets █▁▆▁1347.8311253.261323.8451257.394NANANA1273.022NANANA
us-gaap:LiabilitiesAndStockholdersEquity █▁▆▁1347.8311253.261323.8451257.394NANANA1273.022NANANA
us-gaap:StockholdersEquity ▂▁▄█▆▄▅▃157.17150.819166.815186.013176.26167.325168.79158.896NANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:AssetsCurrent ▂▁█▃490.606479.914569.688507.718NANANA575.319NANANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▄█▅▂▁▁▂▁97.536143.374107.5463.72655.95253.15960.92157.016NANANA
us-gaap:AccountsReceivableNetCurrent ▆▁█▆215.407145.305234.532212.565NANANA262.821NANANA
us-gaap:InventoryNet ▁▃█▇125.313135.31168.481164.799NANANA183.629NANANA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent █▄▁▆39.09134.78232.07237.358NANANA34.938NANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:AssetsNoncurrent █▃▁▁857.225773.346754.157749.676NANANA697.703NANANA
us-gaap:Goodwill █▃▁▄80.60477.09375.42777.341NANANA55.546NANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▁▁▃█47.05647.08148.12450.596NANANA95.245NANANA
us-gaap:OperatingLeaseRightOfUseAsset █▁▁▁82.68128.94329.71827.532NANA30.0NANANANA
us-gaap:OtherAssetsNoncurrent ▁▂▅█2.9713.0863.4343.701NANANA2.928NANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:LiabilitiesCurrent ▄▃█▁328.433315.108373.659285.211NANANA320.336NANANA
us-gaap:DebtCurrent ▇▇█▁123.483136.969144.85436.41NANANA41.02NANANA
us-gaap:LongTermDebtCurrent ▇▇█▁123.483136.969144.85436.41NANANA41.02NANANA
us-gaap:AccountsPayableCurrent ▃▁▇█105.5990.134145.342156.298NANANA163.585NANANA
us-gaap:TaxesPayableCurrent █▃▂▁19.64515.33914.92714.154NANANA28.086NANANA
us-gaap:AccruedLiabilitiesCurrent ▅▃▁█39.6236.12231.93944.931NANANA56.297NANANA
us-gaap:OperatingLeaseLiabilityCurrent 11.5NANANANANANANANANANA
us-gaap:OtherLiabilitiesCurrent █▄▄▁39.14835.63935.71232.509NANANA30.493NANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:LiabilitiesNoncurrent █▁▁▁862.228787.333783.371786.171NANANA793.79NANANA
 us-gaap:LongTermDebt us-gaap:CreditFacility,us-gaap:DebtInstrument oec:TermLoan,oec:TermLoanEUR█▃▁▄373.6358.4351.7361.8NANANANANANANA
 us-gaap:LongTermDebt us-gaap:CreditFacility,us-gaap:DebtInstrument oec:TermLoan,oec:TermLoanUSD▁▃▆█278.6279.5280.4281.3NANANANANANANA
us-gaap:LongTermDebtNoncurrent █▃▁▅640.027625.799619.879630.261NANANA643.748NANANA
 us-gaap:DeferredFinanceCostsNoncurrentNet us-gaap:CreditFacility,us-gaap:DebtInstrument oec:TermLoan,oec:TermLoanFacility▁▂▄█3.8564.0284.2854.733NANANA6.266NANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet ▅▅█▁49.68648.77254.05643.308NANANA45.504NANANA
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent █▃▁▄74.56271.1869.47271.901NANANA60.377NANANA
us-gaap:OtherLiabilitiesNoncurrent █▁▁▁97.95341.58339.96340.701NANANA44.161NANANA
us-gaap:OperatingLeaseLiabilityNoncurrent 72.7NANANANANANANANANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:StockholdersEquity ▂▁▄█▆▄▅▃157.17150.819166.815186.013176.26167.325168.79158.896NANANA
us-gaap:CommonStockValue ███▁85.32385.32385.32385.032NANANA84.254NANANA
us-gaap:AdditionalPaidInCapital ▇▄▁█65.31164.12862.9365.562NANANA63.544NANANA
us-gaap:RetainedEarningsAccumulatedDeficit ▅▁█▆75.50166.50484.28378.296NANANA39.409NANANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▁▂▂█-60.449-56.621-57.206-34.362NANANA-19.628NANANA
us-gaap:TreasuryStockValue ▄▄▄▄8.5158.5158.5158.515NANANA8.683NANANA
us-gaap:StockIssuedDuringPeriodValueNewIssues NANA0.291NANA0.821NANANANANA
 us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents us-gaap:CommonStockNANA0.291NANA0.778NANANANANA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue ██▁1.1821.199-2.632NA2.025-5.7373.553NANANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▁█▁█▆▅▃1.73885.7094.90588.8468.53847.95826.171NANANANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▆▅▃▁▆▅█-30.942-38.55-50.851-60.539-34.452-38.37-22.487NANANANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▂█▁▁▂▃-20.866-12.83694.56-22.303-29.475-17.1710.337NANANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities ▁█▁█▆▅▃1.73885.7094.90588.8468.53847.95826.171NANANANA
us-gaap:NetIncomeLoss ▄▁▅▅▅▅▅▄▅█▅8.997-17.7818.03218.96524.25324.74818.95415.65825.81753.08126.754
us-gaap:DepreciationDepletionAndAmortization ▅▁▅█▁█▅23.99921.87623.84525.22321.99125.40424.095NANANANA
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet ▄▁▄█▅▇▄0.324-4.5760.7117.2431.8445.2760.134NANANANA
us-gaap:IncreaseDecreaseInAccountsReceivable █▁▆▃▄▅▆66.152-90.56831.097-43.262-21.3236.5512.623NANANANA
us-gaap:IncreaseDecreaseInInventories ▄▁█▅▇▆▅-14.375-36.88311.681-11.5242.210.847-7.946NANANANA
us-gaap:ShareBasedCompensation ▄▄▁▆▆▅█1.1821.199-1.1392.3012.0251.5593.553NANANANA
us-gaap:AmortizationOfFinancingCosts ▆▃▃▁▄█▆0.530.50.5010.480.5120.5550.535NANANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities ▆▅▃▁▆▅█-30.942-38.55-50.851-60.539-34.452-38.37-22.487NANANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities ▁▂█▁▁▂▃-20.866-12.83694.56-22.303-29.475-17.1710.337NANANANA
us-gaap:RepaymentsOfLongTermDebt █▄▃▃▁▅▄2.0552.0152.0062.0021.9872.0292.018NANANANA
us-gaap:PaymentsOfDividends ▁▁█████0.00.012.04512.04412.04312.04211.904NANANANA
  2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31

None

us-gaap:CommonStockValue

us-gaap:CommonStockValue


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value8585858584
Percentage of CommonStockValue100.0100.0100.0100.0100.0
Percentage of Assets6.36.86.46.86.6

None

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value60606060
Percentage of CommonStockSharesIssued100.0100.0100.0100.0

None

us-gaap:CommonStockSharesAuthorized

us-gaap:CommonStockSharesAuthorized


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value65656589
Percentage of CommonStockSharesAuthorized100.0100.0100.0100.0

None

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesOutstanding


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value60606059
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0

us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents

us-gaap:CommonStock


None
Period End2020-06-302020-03-312019-12-312019-06-302019-03-312018-12-312017-12-312016-12-31
Value6060606059595959
Percentage of CommonStockSharesOutstanding100.0100.0100.00.00.0100.00.00.0

None

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value616161616161
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0

None

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value606060605959
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0

None

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.15-0.30.30.320.40.410.320.270.430.890.45
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.15-0.290.290.310.390.40.320.250.430.870.44
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value282202336322370399384385393391406
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, oec:Rubber


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value178108216207247259253
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax63.353.464.464.466.865.165.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax63.353.464.464.466.865.165.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments oec:Rubber100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingSegments, oec:Specialties


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value10394119114122139131
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.746.635.635.633.234.934.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax36.746.635.635.633.234.934.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments oec:Specialties100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostOfGoodsAndServicesSold


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value202168245233271294286
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax71.983.273.272.473.373.974.5

None

us-gaap:GrossProfit

us-gaap:GrossProfit


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value79339088981049795109112112
Percentage of GrossProfit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax28.116.826.827.626.726.125.524.827.728.827.6

None

us-gaap:ResearchAndDevelopmentExpense

us-gaap:ResearchAndDevelopmentExpense


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value7.3524.4494.9565.0384.7934.9145.129
Percentage of ResearchAndDevelopmentExpense100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.62.21.51.61.31.21.3

None

us-gaap:SellingGeneralAndAdministrativeExpense

us-gaap:SellingGeneralAndAdministrativeExpense


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value43384449495255
Percentage of SellingGeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.319.013.215.413.413.114.4

None

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value24-12.879373238413426418245
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax8.6-6.411.210.110.410.49.06.910.621.111.1

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-6.714-6.089-2.323-5.236-7.543-4.501-5.636
Percentage of OperatingIncomeLoss-27.847.3-6.2-16.1-19.7-10.9-16.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.4-3.0-0.7-1.6-2.0-1.1-1.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.0

us-gaap:OperatingIncomeLoss us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, oec:Rubber


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value14-13.6452014242621
Percentage of OperatingIncomeLoss60.3105.954.243.463.763.061.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.2-6.76.14.46.66.55.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments oec:Rubber8.2-12.69.46.89.910.18.4

us-gaap:OperatingSegments, oec:Specialties


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value166.8551923211919
Percentage of OperatingIncomeLoss67.5-53.252.072.756.047.955.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.83.45.87.35.85.05.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments oec:Specialties15.77.316.320.617.514.214.5

None

us-gaap:InterestExpense

us-gaap:InterestExpense


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value108.2779.617.0636.57.5666.443
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.84.12.92.21.81.91.7

us-gaap:InterestExpense us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value108.2779.617.0636.57.5666.443
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.84.12.92.21.81.91.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.0

None

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value5.2465.1614.3454.7066.5273.1426.024
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.92.51.31.51.80.81.6

None

us-gaap:OtherNonoperatingIncomeExpense us-gaap:ConsolidationItems

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:CorporateNonSegment


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-3222000.0-1188000.0-873000.0-3922000.0-1933000.0-629000.0-360000.0
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.1-0.6-0.3-1.2-0.5-0.2-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.0

None

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.1821.199-1.1392.3012.0251.5593.553
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.6-0.30.70.50.40.9

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.1821.199-1.1392.3012.0251.5593.553
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.6-0.30.70.50.40.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.0

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:IncomeStatementLocation

us-gaap:CostOfSales


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.0660.0620.0290.0730.055-0.0010.012
Percentage of AllocatedShareBasedCompensationExpense5.65.2-2.53.22.7-0.10.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.0-0.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CostOfSales0.00.00.00.00.00.00.0

us-gaap:GeneralAndAdministrativeExpense


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.8010.916-0.911.7761.6041.3872.598
Percentage of AllocatedShareBasedCompensationExpense67.876.479.977.279.289.073.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.5-0.30.60.40.30.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:GeneralAndAdministrativeExpense0.00.00.00.00.00.00.0

us-gaap:ResearchAndDevelopmentExpense


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.0530.078-0.0870.1450.120.0520.206
Percentage of AllocatedShareBasedCompensationExpense4.56.57.66.35.93.35.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.0-0.00.00.00.00.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ResearchAndDevelopmentExpense0.00.00.00.00.00.00.0

us-gaap:SellingAndMarketingExpense


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.2630.142-0.1720.3070.2460.1220.737
Percentage of AllocatedShareBasedCompensationExpense22.311.815.113.312.17.820.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.1-0.10.10.10.00.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:SellingAndMarketingExpense0.00.00.00.00.00.00.0

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:PlanName

oec:A2018PanIncentive


None
Period End2020-06-302019-12-312019-09-302019-06-30
Value0.00.0730.00.488
Percentage of AllocatedShareBasedCompensationExpense0.03.20.031.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax oec:A2018PanIncentive0.00.00.00.0

oec:A2018PlanPaymentTransaction


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.8310.763-1.2420.5930.6660.9011.275
Percentage of AllocatedShareBasedCompensationExpense70.363.6109.025.832.957.835.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.4-0.40.20.20.20.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax oec:A2018PlanPaymentTransaction0.00.00.00.00.00.00.0

oec:A2019Plan


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.3230.302-0.030.3530.5380.00.0
Percentage of AllocatedShareBasedCompensationExpense27.325.22.615.326.60.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.1-0.00.10.10.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax oec:A2019Plan0.00.00.00.00.00.00.0

oec:A2019PlanCEOIncentive


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.0290.1340.1340.0930.0960.2640.0
Percentage of AllocatedShareBasedCompensationExpense2.511.2-11.84.04.716.90.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.10.00.00.00.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax oec:A2019PlanCEOIncentive0.00.00.00.00.00.00.0

oec:TwoThousandSeventeenPlan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.01.190.725-0.0941.195
Percentage of AllocatedShareBasedCompensationExpense0.0-0.051.735.8-6.033.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.40.2-0.00.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax oec:TwoThousandSeventeenPlan0.00.00.00.00.00.0

oec:TwoThousandSixteenPlan


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.00.00.00.01.083
Percentage of AllocatedShareBasedCompensationExpense0.0-0.00.00.00.030.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.00.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax oec:TwoThousandSixteenPlan0.00.00.00.00.00.0

None

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ConsolidationItems

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:CorporateNonSegment


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-6.714-6.089-2.323-5.236-7.543-4.501-5.636
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-2.4-3.0-0.7-1.6-2.0-1.1-1.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.0

None

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value11-23.81252531332821357336
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.9-11.77.67.98.68.57.35.59.118.89.1

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


None
Period End2020-09-302020-06-302020-03-312019-06-302019-03-31
Value2.2722.6542.3980.00.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments20.5-11.19.40.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.81.30.70.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.0

None

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense


None
Period End2020-09-302020-06-302020-03-312019-06-302019-03-31
Value-2272000.0-2654000.0-2398000.000
Percentage of NonoperatingIncomeExpense100.0100.0100.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.8-1.3-0.70.00.0

us-gaap:NonoperatingIncomeExpense us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


None
Period End2020-09-302020-06-302020-03-31
Value-2272000.0-2654000.0-2398000.0
Percentage of NonoperatingIncomeExpense100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.8-1.3-0.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.0

us-gaap:NonoperatingIncomeExpense us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss


None
Period End2020-03-312019-03-31
Value2400000.00
Percentage of NonoperatingIncomeExpense-100.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.70.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss0.00.0

None

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.25-5.8797.6356.7017.7679.3099.439
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.8-2.92.32.12.12.32.5

us-gaap:IncomeTaxExpenseBenefit us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.25-5.8797.6356.7017.7679.3099.439
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.8-2.92.32.12.12.32.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:CorporateNonSegment0.00.00.00.00.00.00.0

us-gaap:IncomeTaxExpenseBenefit us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


None
Period End2020-09-302020-06-302020-03-312019-06-302019-03-31
Value0.9190.9040.7760.00.0
Percentage of IncomeTaxExpenseBenefit40.8-15.410.20.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.40.20.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.0

None

us-gaap:IncomeTaxesPaidNet

us-gaap:IncomeTaxesPaidNet


None
Period End2020-09-302020-06-302019-12-312019-09-302019-06-30
Value-1.0682.267.931-1.7059.116
Percentage of IncomeTaxesPaidNet100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.41.12.5-0.52.3

None

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value8.997-17.78181824241815255326
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.2-8.85.45.96.66.24.94.16.613.66.6

us-gaap:NetIncomeLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


None
Period End2020-09-302020-06-302020-03-312019-06-302019-03-31
Value1.3541.751.6230.00.0
Percentage of NetIncomeLoss15.0-9.89.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.90.50.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value8.997-17.7818242418
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.2-8.85.46.66.24.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.0

None

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value5.168-17.195-4.81119181518
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.8-8.5-1.46.05.13.94.7

None

us-gaap:Assets

us-gaap:Assets


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-312017-12-31
Value134712531323125712731164
Percentage of Assets100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0

None

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value13471253132312571273
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0

None

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value1571501661861761671681589554
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.712.012.614.80.00.00.012.58.20.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value-6.757-7.747-9.342-11.189-2.693-2.814-2.778-2.831-2.965-7.064
Percentage of StockholdersEquity-4.3-5.1-5.6-6.0-1.5-1.7-1.6-1.8-3.1-12.9
Percentage of Assets-0.5-0.6-0.7-0.90.00.00.0-0.2-0.30.0
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value-14.35-13.152-11.511-10.891-13.071-12.747-8.372-6.147-1.801-15.262
Percentage of StockholdersEquity-9.1-8.7-6.9-5.9-7.4-7.6-5.0-3.9-1.9-27.9
Percentage of Assets-1.1-1.0-0.9-0.90.00.00.0-0.5-0.20.0
Percentage of Assets us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value-60.449-56.621-57.206-34.362-34.892-29.592-20.337-19.628-5.32-17.948
Percentage of StockholdersEquity-38.5-37.5-34.3-18.5-19.8-17.7-12.0-12.4-5.6-32.8
Percentage of Assets-4.5-4.5-4.3-2.70.00.00.0-1.5-0.50.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value-39.342-35.722-36.353-12.281-19.128-14.031-9.187-10.65-0.5544.378
Percentage of StockholdersEquity-25.0-23.7-21.8-6.6-10.9-8.4-5.4-6.7-0.68.0
Percentage of Assets-2.9-2.9-2.7-1.00.00.00.0-0.8-0.00.0
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value6564626563616763102139
Percentage of StockholdersEquity41.642.537.735.236.036.739.840.0107.6254.9
Percentage of Assets4.85.14.85.20.00.00.05.08.80.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value85858585858584848383
Percentage of StockholdersEquity54.356.651.145.748.250.849.953.087.9153.2
Percentage of Assets6.36.86.46.80.00.00.06.67.20.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value7566847871594639-81.901-146.761
Percentage of StockholdersEquity48.044.150.542.140.535.427.524.8-85.9-268.4
Percentage of Assets5.65.36.46.20.00.00.03.1-7.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value-8.515-8.515-8.515-8.515-8.683-8.683-8.683-8.683-3.773-3.773
Percentage of StockholdersEquity-5.4-5.6-5.1-4.6-4.9-5.2-5.1-5.5-4.0-6.9
Percentage of Assets-0.6-0.7-0.6-0.70.00.00.0-0.7-0.30.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.0

None

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value490479569507575
Percentage of AssetsCurrent100.0100.0100.0100.0100.0
Percentage of Assets36.438.343.040.445.2

None

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value97143107635553605772
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets7.211.48.15.10.00.00.04.56.2

None

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value215145234212262
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0
Percentage of Assets16.011.617.716.920.6

None

us-gaap:InventoryNet

us-gaap:InventoryNet


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value125135168164183
Percentage of InventoryNet100.0100.0100.0100.0100.0
Percentage of Assets9.310.812.713.114.4

None

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value3934323734
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0
Percentage of Assets2.92.82.43.02.7

None

us-gaap:AssetsNoncurrent

us-gaap:AssetsNoncurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value857773754749697
Percentage of AssetsNoncurrent100.0100.0100.0100.0100.0
Percentage of Assets63.661.757.059.654.8

None

us-gaap:Goodwill

us-gaap:Goodwill


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-312017-12-31
Value807775775558
Percentage of Goodwill100.0100.0100.0100.0100.0100.0
Percentage of Assets6.06.25.76.24.45.0

None

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value4747485095
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0
Percentage of Assets3.53.83.64.07.5

None

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


None
Period End2020-09-302020-06-302020-03-312019-12-312019-03-312019-01-01
Value822829273030
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0
Percentage of Assets6.12.32.22.20.00.0

None

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value2971000.03086000.03434000.03701000.02928000.0
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.30.30.2

None

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value328315373285320
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0
Percentage of Assets24.425.128.222.725.2

None

us-gaap:DebtCurrent

us-gaap:DebtCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value1231361443641
Percentage of DebtCurrent100.0100.0100.0100.0100.0
Percentage of Assets9.210.910.92.93.2

None

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value1231361443641
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0
Percentage of Assets9.210.910.92.93.2

None

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value10590145156163
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0
Percentage of Assets7.87.211.012.412.9

None

us-gaap:TaxesPayableCurrent

us-gaap:TaxesPayableCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value1915141428
Percentage of TaxesPayableCurrent100.0100.0100.0100.0100.0
Percentage of Assets1.51.21.11.12.2

None

us-gaap:AccruedLiabilitiesCurrent

us-gaap:AccruedLiabilitiesCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value3936314456
Percentage of AccruedLiabilitiesCurrent100.0100.0100.0100.0100.0
Percentage of Assets2.92.92.43.64.4

None

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


None
Period End2020-09-30
Value11
Percentage of OperatingLeaseLiabilityCurrent100.0
Percentage of Assets0.9

None

us-gaap:OtherLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value3935353230
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0
Percentage of Assets2.92.82.72.62.4

None

us-gaap:LiabilitiesNoncurrent

us-gaap:LiabilitiesNoncurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value862787783786793
Percentage of LiabilitiesNoncurrent100.0100.0100.0100.0100.0
Percentage of Assets64.062.859.262.562.4

None

us-gaap:LongTermDebt us-gaap:CreditFacility, us-gaap:DebtInstrument

us-gaap:LongTermDebt

oec:TermLoan, oec:TermLoanEUR


None
Period End2020-09-302020-06-302020-03-312019-12-31
Value373358351361
Percentage of LongTermDebt100.0100.0100.0100.0
Percentage of Assets27.728.626.628.8
Percentage of Assets oec:TermLoan oec:TermLoanEUR0.00.00.00.0

oec:TermLoan, oec:TermLoanUSD


None
Period End2020-09-302020-06-302020-03-312019-12-31
Value278279280281
Percentage of LongTermDebt74.678.079.777.8
Percentage of Assets20.722.321.222.4
Percentage of Assets oec:TermLoan oec:TermLoanUSD0.00.00.00.0

None

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value640625619630643
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0
Percentage of Assets47.549.946.850.150.6

None

us-gaap:DeferredFinanceCostsNoncurrentNet us-gaap:CreditFacility, us-gaap:DebtInstrument

us-gaap:DeferredFinanceCostsNoncurrentNet

oec:TermLoan, oec:TermLoanFacility


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value3856000.04028000.04285000.04733000.06266000.0
Percentage of DeferredFinanceCostsNoncurrentNet100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.30.40.5
Percentage of Assets oec:TermLoan oec:TermLoanFacility0.00.00.00.00.0

None

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value4948544345
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0
Percentage of Assets3.73.94.13.43.6

None

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value7471697160
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0100.0100.0100.0
Percentage of Assets5.55.75.25.74.7

None

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value9741394044
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0
Percentage of Assets7.33.33.03.23.5

None

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


None
Period End2020-09-30
Value72
Percentage of OperatingLeaseLiabilityNoncurrent100.0
Percentage of Assets5.4

None

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value1571501661861761671681589554
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.712.012.614.80.00.00.012.58.20.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value-6.757-7.747-9.342-11.189-2.693-2.814-2.778-2.831-2.965-7.064
Percentage of StockholdersEquity-4.3-5.1-5.6-6.0-1.5-1.7-1.6-1.8-3.1-12.9
Percentage of Assets-0.5-0.6-0.7-0.90.00.00.0-0.2-0.30.0
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value-14.35-13.152-11.511-10.891-13.071-12.747-8.372-6.147-1.801-15.262
Percentage of StockholdersEquity-9.1-8.7-6.9-5.9-7.4-7.6-5.0-3.9-1.9-27.9
Percentage of Assets-1.1-1.0-0.9-0.90.00.00.0-0.5-0.20.0
Percentage of Assets us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges0.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedOtherComprehensiveIncome


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value-60.449-56.621-57.206-34.362-34.892-29.592-20.337-19.628-5.32-17.948
Percentage of StockholdersEquity-38.5-37.5-34.3-18.5-19.8-17.7-12.0-12.4-5.6-32.8
Percentage of Assets-4.5-4.5-4.3-2.70.00.00.0-1.5-0.50.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.0

us-gaap:AccumulatedTranslationAdjustment


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value-39.342-35.722-36.353-12.281-19.128-14.031-9.187-10.65-0.5544.378
Percentage of StockholdersEquity-25.0-23.7-21.8-6.6-10.9-8.4-5.4-6.7-0.68.0
Percentage of Assets-2.9-2.9-2.7-1.00.00.00.0-0.8-0.00.0
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment0.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value6564626563616763102139
Percentage of StockholdersEquity41.642.537.735.236.036.739.840.0107.6254.9
Percentage of Assets4.85.14.85.20.00.00.05.08.80.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value85858585858584848383
Percentage of StockholdersEquity54.356.651.145.748.250.849.953.087.9153.2
Percentage of Assets6.36.86.46.80.00.00.06.67.20.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value7566847871594639-81.901-146.761
Percentage of StockholdersEquity48.044.150.542.140.535.427.524.8-85.9-268.4
Percentage of Assets5.65.36.46.20.00.00.03.1-7.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value-8.515-8.515-8.515-8.515-8.683-8.683-8.683-8.683-3.773-3.773
Percentage of StockholdersEquity-5.4-5.6-5.1-4.6-4.9-5.2-5.1-5.5-4.0-6.9
Percentage of Assets-0.6-0.7-0.6-0.70.00.00.0-0.7-0.30.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.0

None

us-gaap:CommonStockValue

us-gaap:CommonStockValue


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value8585858584
Percentage of CommonStockValue100.0100.0100.0100.0100.0
Percentage of Assets6.36.86.46.86.6

None

us-gaap:AdditionalPaidInCapital

us-gaap:AdditionalPaidInCapital


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value6564626563
Percentage of AdditionalPaidInCapital100.0100.0100.0100.0100.0
Percentage of Assets4.85.14.85.25.0

None

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value7566847839
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0
Percentage of Assets5.65.36.46.23.1

None

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value-60449000.0-56621000.0-57206000.0-34362000.0-19628000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0
Percentage of Assets-4.5-4.5-4.3-2.7-1.5

None

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value8515000.08515000.08515000.08515000.08683000.0
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0
Percentage of Assets0.60.70.60.70.7

None

us-gaap:StockIssuedDuringPeriodValueNewIssues

us-gaap:StockIssuedDuringPeriodValueNewIssues


None
Period End2020-03-312019-06-30
Value291000.0821000.0
Percentage of StockIssuedDuringPeriodValueNewIssues100.0100.0
Percentage of Assets0.00.0

us-gaap:StockIssuedDuringPeriodValueNewIssues us-gaap:StatementEquityComponents

us-gaap:CommonStock


None
Period End2020-03-312019-06-30
Value291000.0778000.0
Percentage of StockIssuedDuringPeriodValueNewIssues100.094.8
Percentage of Assets0.00.0
Percentage of Assets us-gaap:CommonStock0.00.0

None

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value1182000.01199000.0-2632000.02025000.0-5737000.03553000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value1182000.01199000.0-2632000.02025000.0-5737000.03553000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.0

None

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.738854.90588684726
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.642.31.527.618.512.06.8

None

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-30942000.0-38550000.0-50851000.0-60539000.0-34452000.0-38370000.0-22487000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-11.0-19.0-15.1-18.8-9.3-9.6-5.8

None

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-20.866-12.83694-22.303-29.475-17.1710.337
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-7.4-6.328.1-6.9-8.0-4.30.1

None

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.738854.90588684726
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.642.31.527.618.512.06.8

None

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value8.997-17.78181824241815255326
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.2-8.85.45.96.66.24.94.16.613.66.6

us-gaap:NetIncomeLoss us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


None
Period End2020-09-302020-06-302020-03-312019-06-302019-03-31
Value1.3541.751.6230.00.0
Percentage of NetIncomeLoss15.0-9.89.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.90.50.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value8.997-17.7818242418
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.2-8.85.46.66.24.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.0

None

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value23212325212524
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.324-4.5760.7117.2431.8445.2760.134
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInAccountsReceivable


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value66-90.56831-43.262-21.3236.5512
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:IncreaseDecreaseInInventories

us-gaap:IncreaseDecreaseInInventories


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-14.375-36.88311-11.5242.210.847-7.946
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.1821.199-1.1392.3012.0251.5593.553
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:AmortizationOfFinancingCosts

us-gaap:AmortizationOfFinancingCosts


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value530000.0500000.0501000.0480000.0512000.0555000.0535000.0
Percentage of AmortizationOfFinancingCosts100.0100.0100.0100.0100.0100.0100.0

us-gaap:AmortizationOfFinancingCosts us-gaap:CreditFacility

us-gaap:RevolvingCreditFacility


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value200000.0200000.0200000.0200000.0100000.0200000.0200000.0
Percentage of AmortizationOfFinancingCosts37.740.039.941.719.536.037.4

us-gaap:AmortizationOfFinancingCosts us-gaap:CreditFacility, us-gaap:DebtInstrument

oec:TermLoan, oec:TermLoanFacility


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value400000.0300000.0300000.0300000.0400000.0400000.0300000.0
Percentage of AmortizationOfFinancingCosts75.560.059.962.578.172.156.1

None

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-30942000.0-38550000.0-50851000.0-60539000.0-34452000.0-38370000.0-22487000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-11.0-19.0-15.1-18.8-9.3-9.6-5.8

None

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-20.866-12.83694-22.303-29.475-17.1710.337
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-7.4-6.328.1-6.9-8.0-4.30.1

None

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.0552.0152.0062.0021.9872.0292.018
Percentage of RepaymentsOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:PaymentsOfDividends

us-gaap:PaymentsOfDividends


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.01212121211
Percentage of PaymentsOfDividends0.00.0100.0100.0100.0100.0100.0

None

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value30.20.28910.2919-30.32430.60.2960.301
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0

None

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-312016-12-31
Value10014611068605765617580
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

oec:AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslation

oec:AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslation


None
Period End2020-09-302019-09-30
Value-87000.0-224000.0
Percentage of AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslation100.0100.0

oec:ActuarialGainLossRecognizedInEarnings

oec:ActuarialGainLossRecognizedInEarnings


None
Period End2020-09-302020-06-302020-03-312019-06-302019-03-31
Value-2272000.0-2654000.0-2398000.000
Percentage of ActuarialGainLossRecognizedInEarnings100.0100.0100.00.00.0

oec:AdjustedEarningsBeforeInterestTaxDepreciationandAmortization

oec:AdjustedEarningsBeforeInterestTaxDepreciationandAmortization


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value55156363687164
Percentage of AdjustedEarningsBeforeInterestTaxDepreciationandAmortization100.0100.0100.0100.0100.0100.0100.0

oec:AdjustedEarningsBeforeInterestTaxDepreciationandAmortization us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, oec:Rubber


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value28-1.2333531384035
Percentage of AdjustedEarningsBeforeInterestTaxDepreciationandAmortization51.9-8.156.049.756.056.654.5

us-gaap:OperatingSegments, oec:Specialties


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value26162831293129
Percentage of AdjustedEarningsBeforeInterestTaxDepreciationandAmortization48.1108.144.050.344.043.445.5

oec:CashInflowsRelatedToCurrentFinancialLiabilitiesFinancingActivities

oec:CashInflowsRelatedToCurrentFinancialLiabilitiesFinancingActivities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value39411098.5459.7244137
Percentage of CashInflowsRelatedToCurrentFinancialLiabilitiesFinancingActivities100.0100.0100.0100.0100.0100.0100.0

oec:CashOutflowsRelatedToCurrentFinancialLiabilitiesFinancingActivities

oec:CashOutflowsRelatedToCurrentFinancialLiabilitiesFinancingActivities


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value58520.016253622
Percentage of CashOutflowsRelatedToCurrentFinancialLiabilitiesFinancingActivities100.0100.00.0100.0100.0100.0100.0

oec:CorporateCharges

oec:CorporateCharges


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value6.7146.0892.3235.2367.5434.5015.636
Percentage of CorporateCharges100.0100.0100.0100.0100.0100.0100.0

oec:CorporateCharges us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value6.7146.0892.3235.2367.5434.5015.636
Percentage of CorporateCharges100.0100.0100.0100.0100.0100.0100.0

oec:DebtInstrumentFloorOfVariableRateBasis us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:VariableRate

oec:DebtInstrumentFloorOfVariableRateBasis

oec:TermLoan, oec:TermLoanEUR, oec:EuroInterbankOfferedRateEURIBOR


None
Period End2020-06-302020-03-312014-07-25
Value000.01
Percentage of DebtInstrumentFloorOfVariableRateBasis0.00.0100.0

oec:TermLoan, oec:TermLoanUSD, us-gaap:LondonInterbankOfferedRateLIBOR


None
Period End2020-06-302020-03-312014-07-25
Value000.01
Percentage of DebtInstrumentFloorOfVariableRateBasis0.00.0100.0

oec:DepreciationAmortizationAndAssetImpairment

oec:DepreciationAmortizationAndAssetImpairment


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value23212325212524
Percentage of DepreciationAmortizationAndAssetImpairment100.0100.0100.0100.0100.0100.0100.0

oec:DepreciationAmortizationAndAssetImpairment us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, oec:Rubber


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value13121517131413
Percentage of DepreciationAmortizationAndAssetImpairment57.656.064.168.061.555.957.1

us-gaap:OperatingSegments, oec:Specialties


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value109.6168.5528.0798.4671110
Percentage of DepreciationAmortizationAndAssetImpairment42.444.035.932.038.544.142.9

oec:EffectiveIncomeTaxRateReconciliationNetDiscreteTaxExpenseAmount

oec:EffectiveIncomeTaxRateReconciliationNetDiscreteTaxExpenseAmount


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value100000.01200000.0-700000.02600000.0700000.0900000.0
Percentage of EffectiveIncomeTaxRateReconciliationNetDiscreteTaxExpenseAmount100.0100.0100.0100.0100.0100.0

oec:EnvironmentalProtectionAgencyRelatedExpense us-gaap:ConsolidationItems

oec:EnvironmentalProtectionAgencyRelatedExpense

us-gaap:CorporateNonSegment


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value1487000.0977000.02589000.01549000.0690000.0718000.0
Percentage of EnvironmentalProtectionAgencyRelatedExpense100.0100.0100.0100.0100.0100.0

oec:ExtraordinaryExpenseItemsRelatedToCOVID19 us-gaap:ConsolidationItems

oec:ExtraordinaryExpenseItemsRelatedToCOVID19

us-gaap:CorporateNonSegment


None
Period End2020-09-302020-06-302019-06-30
Value822000.02725000.00
Percentage of ExtraordinaryExpenseItemsRelatedToCOVID19100.0100.00.0

oec:FinanceLeaseCost

oec:FinanceLeaseCost


None
Period End2020-09-30
Value600000.0
Percentage of FinanceLeaseCost100.0

oec:IncreaseDecreaseInProvisions

oec:IncreaseDecreaseInProvisions


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-2.633-3.83311-1.15-3.301-5.99520
Percentage of IncreaseDecreaseInProvisions100.0100.0100.0100.0100.0100.0100.0

oec:InventoryReservePeriodChange

oec:InventoryReservePeriodChange


None
Period End2020-03-312019-03-31
Value2900000.00
Percentage of InventoryReservePeriodChange100.00.0

oec:NumberOfFacilitiesOwned

oec:NumberOfFacilitiesOwned


None
Period End2020-06-302020-03-31
Value013.0
Percentage of NumberOfFacilitiesOwned0.0100.0

oec:NumberOfFacilitiesOwned us-gaap:StatementGeographical

country:US


None
Period End2020-06-302020-03-31
Value04.0
Percentage of NumberOfFacilitiesOwned0.030.8

oec:NumberOfRelatedParties us-gaap:RelatedPartyTransactionsByRelatedParty

oec:NumberOfRelatedParties

us-gaap:EquityMethodInvestee


None
Period End2020-06-302020-03-31
Value01.0
Percentage of NumberOfRelatedParties0.0100.0

us-gaap:PrincipalOwner


None
Period End2020-06-302020-03-31
Value01.0
Percentage of NumberOfRelatedParties0.0100.0

oec:OperatingLeaseLiabilityPeriodIncreaseDecreaseCurrent

oec:OperatingLeaseLiabilityPeriodIncreaseDecreaseCurrent


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value3862000.0-1441000.02982000.0-1148000.01782000.05144000.0
Percentage of OperatingLeaseLiabilityPeriodIncreaseDecreaseCurrent100.0100.0100.0100.0100.0100.0

oec:OperatingLeaseLiabilityPeriodIncreaseDecreaseNoncurrent

oec:OperatingLeaseLiabilityPeriodIncreaseDecreaseNoncurrent


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value510.4461.2421.113-1.63225
Percentage of OperatingLeaseLiabilityPeriodIncreaseDecreaseNoncurrent100.0100.0100.0100.0100.0100.0

oec:PensionObligationsActuarialLossesAsAPercentageOfDefinedBenefitObligations

oec:PensionObligationsActuarialLossesAsAPercentageOfDefinedBenefitObligations


None
Period End2020-09-30
Value9.9
Percentage of PensionObligationsActuarialLossesAsAPercentageOfDefinedBenefitObligations100.0

oec:ReclassificationFromAOCICurrentPeriodForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

oec:ReclassificationFromAOCICurrentPeriodForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-573000.0-280000.0420000.0658000.0-190000.0133000.0
Percentage of ReclassificationFromAOCICurrentPeriodForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax100.0100.0100.0100.0100.0100.0

oec:ReclassificationFromAOCICurrentPeriodForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-364000.0-155000.0225000.0121000.0-36000.053000.0
Percentage of ReclassificationFromAOCICurrentPeriodForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax63.555.453.618.418.939.8

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-209000.0-125000.0195000.0537000.0-154000.080000.0
Percentage of ReclassificationFromAOCICurrentPeriodForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax36.544.646.481.681.160.2

oec:RestructuringSettlementAndImpairmentProvisionsNet

oec:RestructuringSettlementAndImpairmentProvisionsNet


None
Period End2020-03-312019-03-31
Value0100000.0
Percentage of RestructuringSettlementAndImpairmentProvisionsNet0.0100.0

oec:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod us-gaap:AwardType, us-gaap:PlanName

oec:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod

us-gaap:PerformanceShares, oec:TwoThousandSeventeenPlan


None
Period End2020-03-31
Value378160.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod100.0

oec:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceBasedAdjustment us-gaap:AwardType

oec:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceBasedAdjustment

us-gaap:PerformanceShares


None
Period End2020-06-302020-03-31
Value0-40087.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceBasedAdjustment0.0100.0

oec:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceBasedAdjustment us-gaap:AwardType, us-gaap:PlanName

us-gaap:PerformanceShares, oec:TwoThousandSeventeenPlan


None
Period End2020-06-302020-03-31
Value040087.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformanceBasedAdjustment0.0-100.0

oec:ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsSettledInPeriod us-gaap:AwardType

oec:ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsSettledInPeriod

us-gaap:PerformanceShares


None
Period End2020-06-302020-03-31
Value0378160.0
Percentage of ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsSettledInPeriod0.0100.0

oec:ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsSettledInPeriod us-gaap:AwardType, us-gaap:PlanName

us-gaap:PerformanceShares, oec:TwoThousandSeventeenPlan


None
Period End2020-06-302020-03-31
Value0378160.0
Percentage of ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsSettledInPeriod0.0100.0

oec:SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsCorrelation us-gaap:AwardType, us-gaap:PlanName

oec:SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsCorrelation

us-gaap:PerformanceShares, oec:TwoThousandEighteenPlan


None
Period End2020-09-302020-06-302020-03-31
Value000.3659
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsCorrelation0.00.0100.0

us-gaap:PerformanceShares, oec:TwoThousandNineteenPlan


None
Period End2020-09-302020-06-302020-03-31
Value000.5205
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsCorrelation0.00.0142.3

us-gaap:PerformanceShares, oec:TwoThousandSeventeenPlan


None
Period End2020-09-302020-06-302020-03-31
Value000.4574
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsCorrelation0.00.0125.0

oec:SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateOEC us-gaap:AwardType, us-gaap:PlanName

oec:SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateOEC

us-gaap:PerformanceShares, oec:TwoThousandEighteenPlan


None
Period End2020-09-302020-06-302020-03-31
Value29.91800.3022
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateOEC100.00.0100.0

us-gaap:PerformanceShares, oec:TwoThousandNineteenPlan


None
Period End2020-09-302020-06-302020-03-31
Value32.96700.333
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateOEC110.20.0110.2

us-gaap:PerformanceShares, oec:TwoThousandSeventeenPlan


None
Period End2020-09-302020-06-302020-03-31
Value33.43200.3377
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateOEC111.70.0111.7

oec:SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsExpectedVolatilityRatePeerGroup us-gaap:AwardType, us-gaap:PlanName

oec:SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsExpectedVolatilityRatePeerGroup

us-gaap:PerformanceShares, oec:TwoThousandEighteenPlan


None
Period End2020-09-302020-06-302020-03-31
Value19.88900.2009
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsExpectedVolatilityRatePeerGroup100.00.0100.0

us-gaap:PerformanceShares, oec:TwoThousandNineteenPlan


None
Period End2020-09-302020-06-302020-03-31
Value17.44400.1762
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsExpectedVolatilityRatePeerGroup87.70.087.7

us-gaap:PerformanceShares, oec:TwoThousandSeventeenPlan


None
Period End2020-09-302020-06-302020-03-31
Value17.12700.173
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsExpectedVolatilityRatePeerGroup86.10.086.1

us-gaap:AllowanceForDoubtfulAccountsReceivableRecoveries

us-gaap:AllowanceForDoubtfulAccountsReceivableRecoveries


None
Period End2020-09-302019-09-30
Value306000.0367000.0
Percentage of AllowanceForDoubtfulAccountsReceivableRecoveries100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-50.0734485.9984.611-7.5834.021
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:CommonStockDividendsPerShareDeclared


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value000.20.20.20.20.2
Percentage of CommonStockDividendsPerShareDeclared0.00.0100.0100.0100.0100.0100.0

us-gaap:ConcentrationRiskPercentage1 us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType, us-gaap:StatementBusinessSegments

us-gaap:ConcentrationRiskPercentage1

us-gaap:SalesRevenueNet, us-gaap:ProductConcentrationRisk, oec:Rubber


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value63.00.530.6467.00.650.66
Percentage of ConcentrationRiskPercentage1100.0100.0100.0100.0100.0100.0

us-gaap:SalesRevenueNet, us-gaap:ProductConcentrationRisk, oec:Specialties


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value37.00.470.3633.00.350.34
Percentage of ConcentrationRiskPercentage158.788.756.249.353.851.5

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:VariableRate

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1

oec:TermLoan, oec:TermLoanEUR, oec:EuroInterbankOfferedRateEURIBOR


None
Period End2020-03-31
Value0.0225
Percentage of DebtInstrumentBasisSpreadOnVariableRate1100.0

oec:TermLoan, oec:TermLoanUSD, us-gaap:LondonInterbankOfferedRateLIBOR


None
Period End2020-03-31
Value0.02
Percentage of DebtInstrumentBasisSpreadOnVariableRate188.9

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:CreditFacility, us-gaap:VariableRate

us-gaap:RevolvingCreditFacility, us-gaap:Eurodollar


None
Period End2020-06-302020-03-312019-04-022019-04-01
Value0.02150.02150.000190.025
Percentage of DebtInstrumentBasisSpreadOnVariableRate10.095.60.00.0

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:StatementScenario, us-gaap:CreditFacility, us-gaap:VariableRate

srt:ScenarioForecast, us-gaap:RevolvingCreditFacility, us-gaap:Eurodollar


None
Period End2020-12-312020-09-30
Value2.72.4
Percentage of DebtInstrumentBasisSpreadOnVariableRate10.00.0

us-gaap:DeferredIncomeTaxesAndTaxCredits

us-gaap:DeferredIncomeTaxesAndTaxCredits


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-4.725-4.634-1.865143.8470.839-2.913
Percentage of DeferredIncomeTaxesAndTaxCredits100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit

us-gaap:DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit


None
Period End2020-03-312019-03-31
Value-2398000.00
Percentage of DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit100.00.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses


None
Period End2020-09-302020-06-302019-06-30
Value-2272000.0-2654000.00
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.00.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLoss


None
Period End2020-09-302020-06-302019-06-30
Value-2272000.0-2654000.00
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.00.0

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:DefinedBenefitPlanInterestCost


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value298000.0282000.0295000.0418000.0419000.0425000.0432000.0
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2857000.03203000.02996000.0-143000.0720000.0843000.0743000.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:DefinedBenefitPlanServiceCost


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value287000.0267000.0303000.0-442000.0301000.0418000.0311000.0
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStock

us-gaap:DividendsCommonStock


None
Period End2020-03-312019-09-302019-06-302019-03-31
Value12121211
Percentage of DividendsCommonStock100.0100.0100.0100.0

us-gaap:DividendsCommonStock us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


None
Period End2020-03-312019-09-302019-06-302019-03-31
Value12121211
Percentage of DividendsCommonStock100.0100.0100.0100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4357000.01570000.0-6630000.01925000.0-1999000.0-146000.0-200000.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0

us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate

us-gaap:EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value20.00.24850.297524.30.2730.334
Percentage of EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate100.0100.0100.0100.0100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.0130.988-1.2191.468-2.230.645-0.935
Percentage of ForeignCurrencyTransactionGainLossBeforeTax100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromEquityMethodInvestments


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value141000.0151000.0133000.0134000.0134000.0153000.0137000.0
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromEquityMethodInvestments us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, oec:Rubber


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value141000.0151000.0133000.0134000.0134000.0153000.0137000.0
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance

us-gaap:IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance


None
Period End2020-09-302020-06-30
Value1000000.0200000.0
Percentage of IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableTrade

us-gaap:IncreaseDecreaseInAccountsPayableTrade


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value14-50.1334.391-4.998-13.9022.9963.868
Percentage of IncreaseDecreaseInAccountsPayableTrade100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccruedTaxesPayable

us-gaap:IncreaseDecreaseInAccruedTaxesPayable


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value7.674-3.39212-11.0686.15-4.0841.748
Percentage of IncreaseDecreaseInAccruedTaxesPayable100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value772000.0776000.01115000.0-11000.01241000.01141000.01595000.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0

us-gaap:InventoryWriteDown

us-gaap:InventoryWriteDown


None
Period End2020-03-312019-03-31
Value3400000.0100000.0
Percentage of InventoryWriteDown100.0100.0

us-gaap:LeaseCost

us-gaap:LeaseCost


None
Period End2020-06-302019-06-30
Value2400000.02700000.0
Percentage of LeaseCost100.0100.0

us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent

us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-4.787-1.424-23.976-6.118-10.905-2.235
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent100.0100.0100.0100.0100.0100.0

us-gaap:OciBeforeReclassificationsBeforeTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-1.284-2.224-1.241-1.412-5.951-3.767
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent26.8156.25.223.154.6168.5

us-gaap:AccumulatedTranslationAdjustment


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-3.5030.8-22.735-4.706-4.9541.532
Percentage of OciBeforeReclassificationsBeforeTaxAttributableToParent73.2-56.294.876.945.4-68.5

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseCost


None
Period End2020-09-302019-09-30
Value2900000.02700000.0
Percentage of OperatingLeaseCost100.0100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value2600000.02100000.02200000.02300000.02600000.02700000.0
Percentage of OperatingLeasePayments100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-990000.0-1595000.0-1847000.08496000.0-121000.036000.0-53000.0
Percentage of OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-3620000.0631000.0-24071000.06846000.0-5097000.0-4844000.01463000.0
Percentage of OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-178000.0-539000.0910000.0-160000.0-1840000.0-1393000.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-294000.0-708000.0-426000.0-551000.0-1730000.0-1462000.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax165.2131.4-46.8344.494.0105.0

us-gaap:AccumulatedTranslationAdjustment


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value117000.0169000.01336000.0391000.0-110000.069000.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsTax-65.7-31.4146.8-244.46.0-5.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-1133000.0-1609000.0-656000.0-396000.0-4375000.0-2225000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAfterAdjustmentsAndTaxParent

us-gaap:OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAfterAdjustmentsAndTaxParent


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-65000.0-31000.036000.072000.000
Percentage of OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAfterAdjustmentsAndTaxParent100.0100.0100.0100.00.00.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-3.8290.585-22.8440.53-5.3-9.255-0.709
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


None
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-31
Value-3.8290.585-22.844-5.3-9.255-0.709
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0

us-gaap:OtherCostAndExpenseOperating

us-gaap:OtherCostAndExpenseOperating


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4.5273.8263.1752.0023.1894.5032.475
Percentage of OtherCostAndExpenseOperating100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoncashIncomeExpense

us-gaap:OtherNoncashIncomeExpense


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value790000.0-548000.0-360000.03341000.0-862000.0-3264000.0-1028000.0
Percentage of OtherNoncashIncomeExpense100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForRestructuring

us-gaap:PaymentsForRestructuring


None
Period End2020-09-302020-06-302020-03-31
Value0.8620.7081.432
Percentage of PaymentsForRestructuring100.0100.0100.0

us-gaap:PaymentsForRestructuring us-gaap:RestructuringCostAndReserve

oec:GroundRemediationCostsRelatedToRestructuring


None
Period End2020-09-302020-06-302020-03-31
Value0.0480.1480.252
Percentage of PaymentsForRestructuring5.620.917.6

us-gaap:EmployeeSeverance


None
Period End2020-09-302020-06-302020-03-31
Value0.8140.4860.514
Percentage of PaymentsForRestructuring94.468.635.9

us-gaap:FacilityClosing


None
Period End2020-06-302020-03-31
Value0.0740.402
Percentage of PaymentsForRestructuring10.528.1

us-gaap:OtherRestructuring


None
Period End2020-06-302020-03-31
Value0.00.263
Percentage of PaymentsForRestructuring0.018.4

us-gaap:PaymentsOfDebtIssuanceCosts

us-gaap:PaymentsOfDebtIssuanceCosts


None
Period End2020-06-302019-12-312019-09-302019-06-30
Value0001721000.0
Percentage of PaymentsOfDebtIssuanceCosts0.00.00.0100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value001202000.0006475000.00
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation0.00.0100.00.00.0100.00.0

us-gaap:PaymentsToAcquireProductiveAssets

us-gaap:PaymentsToAcquireProductiveAssets


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value30385060343822
Percentage of PaymentsToAcquireProductiveAssets100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProfessionalFees us-gaap:ConsolidationItems

us-gaap:ProfessionalFees

us-gaap:CorporateNonSegment


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value002174000.0-674000.0589000.0916000.0
Percentage of ProfessionalFees0.00.0100.0100.0100.0100.0

us-gaap:ProvisionForDoubtfulAccounts

us-gaap:ProvisionForDoubtfulAccounts


None
Period End2020-09-302019-09-30
Value1796000.0-103000.0
Percentage of ProvisionForDoubtfulAccounts100.0100.0

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent


None
Period End2020-09-302020-06-302020-03-312019-03-31
Value-2272000.0-2654000.0-2398000.00
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0100.00.0

us-gaap:ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


None
Period End2020-09-302020-06-302020-03-312019-03-31
Value-2272000.0-2654000.0-2398000.00
Percentage of ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent100.0100.0100.00.0

us-gaap:ReclassificationFromAociCurrentPeriodTax

us-gaap:ReclassificationFromAociCurrentPeriodTax


None
Period End2020-09-302020-06-302020-03-312019-03-31
Value-919000.0-904000.0-776000.00
Percentage of ReclassificationFromAociCurrentPeriodTax100.0100.0100.00.0

us-gaap:ReclassificationFromAociCurrentPeriodTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment


None
Period End2020-09-302020-06-302020-03-312019-03-31
Value-919000.0-904000.0-776000.00
Percentage of ReclassificationFromAociCurrentPeriodTax100.0100.0100.00.0

us-gaap:RelatedPartyTransactionPurchasesFromRelatedParty us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:RelatedPartyTransactionPurchasesFromRelatedParty

srt:AffiliatedEntity


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value17102124192322
Percentage of RelatedPartyTransactionPurchasesFromRelatedParty100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestructuringReserveTranslationAdjustment

us-gaap:RestructuringReserveTranslationAdjustment


None
Period End2020-09-302020-06-302020-03-31
Value-116000.0-59000.0113000.0
Percentage of RestructuringReserveTranslationAdjustment100.0100.0100.0

us-gaap:RestructuringReserveTranslationAdjustment us-gaap:RestructuringCostAndReserve

oec:GroundRemediationCostsRelatedToRestructuring


None
Period End2020-09-302020-06-302020-03-31
Value-3000.0-2000.014000.0
Percentage of RestructuringReserveTranslationAdjustment2.63.412.4

us-gaap:EmployeeSeverance


None
Period End2020-09-302020-06-302020-03-31
Value-107000.0-53000.081000.0
Percentage of RestructuringReserveTranslationAdjustment92.289.871.7

us-gaap:FacilityClosing


None
Period End2020-09-302020-06-302020-03-31
Value-3000.0-2000.011000.0
Percentage of RestructuringReserveTranslationAdjustment2.63.49.7

us-gaap:OtherRestructuring


None
Period End2020-09-302020-06-302020-03-31
Value-2000.0-1000.06000.0
Percentage of RestructuringReserveTranslationAdjustment1.71.75.3

us-gaap:RestructuringSettlementAndImpairmentProvisions

us-gaap:RestructuringSettlementAndImpairmentProvisions


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.0-0.2052.711.0340.089
Percentage of RestructuringSettlementAndImpairmentProvisions0.00.0100.0100.0100.0100.0

us-gaap:RestructuringSettlementAndImpairmentProvisions us-gaap:ConsolidationItems

us-gaap:CorporateNonSegment


None
Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.0-0.2052.711.0340.089
Percentage of RestructuringSettlementAndImpairmentProvisions0.00.0100.0100.0100.0100.0

us-gaap:RevenueFromRelatedParties us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:RevenueFromRelatedParties

srt:AffiliatedEntity


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1396000.0654000.0634000.0637000.0596000.0829000.0663000.0
Percentage of RevenueFromRelatedParties100.0100.0100.0100.0100.0100.0100.0

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability


None
Period End2020-09-30
Value54
Percentage of RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod

us-gaap:PerformanceShares


None
Period End2020-06-302020-03-31
Value2603.04844.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod100.0100.0

us-gaap:RestrictedStockUnitsRSU


None
Period End2020-06-302020-03-31
Value1508.01895.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod57.939.1

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod us-gaap:AwardType, us-gaap:GranteeStatus, us-gaap:PlanName

us-gaap:RestrictedStockUnitsRSU, oec:ShareBasedPaymentArrangementEmployeeExistingEmployees, oec:TwoThousandNineteenPlan


None
Period End2020-06-302020-03-31
Value1508.01895.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod57.939.1

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod us-gaap:AwardType, us-gaap:PlanName

us-gaap:PerformanceShares, oec:TwoThousandEighteenPlan


None
Period End2020-06-302020-03-31
Value1095.02949.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod42.160.9

us-gaap:PerformanceShares, oec:TwoThousandNineteenPlan


None
Period End2020-06-302020-03-31
Value1508.01895.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod57.939.1

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate us-gaap:AwardType, us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate

us-gaap:PerformanceShares, oec:TwoThousandEighteenPlan


None
Period End2020-09-302020-06-302020-03-31
Value1.920600.0194
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate100.00.0100.0

us-gaap:PerformanceShares, oec:TwoThousandNineteenPlan


None
Period End2020-09-302020-06-302020-03-31
Value4.603500.0465
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate239.70.0239.7

us-gaap:PerformanceShares, oec:TwoThousandSeventeenPlan


None
Period End2020-09-302020-06-302020-03-31
Value1.861200.0188
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate96.90.096.9

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate us-gaap:AwardType, us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate

us-gaap:PerformanceShares, oec:TwoThousandEighteenPlan


None
Period End2020-09-302020-06-302020-03-31
Value1.445400.0146
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate100.00.0100.0

us-gaap:PerformanceShares, oec:TwoThousandNineteenPlan


None
Period End2020-09-302020-06-302020-03-31
Value1.811700.0183
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate125.30.0125.3

us-gaap:PerformanceShares, oec:TwoThousandSeventeenPlan


None
Period End2020-09-302020-06-302020-03-31
Value1.435500.0145
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate99.30.099.3

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType, us-gaap:GranteeStatus, us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

us-gaap:RestrictedStockUnitsRSU, oec:ShareBasedPaymentArrangementEmployeeExistingEmployees, oec:TwoThousandNineteenPlan


None
Period End2020-09-302020-06-302020-03-31
Value0014.74
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.00.0100.0

us-gaap:RestrictedStockUnitsRSU, oec:ShareBasedPaymentArrangementEmployeeNewHireSignOn, oec:TwoThousandEighteenPlan


None
Period End2020-09-302020-06-302020-03-31
Value0025.81
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.00.0175.1

us-gaap:RestrictedStockUnitsRSU, oec:ShareBasedPaymentArrangementEmployeeNewHireSignOn, oec:TwoThousandNineteenPlan


None
Period End2020-09-302020-06-302020-03-31
Value0015.89
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.00.0107.8

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType, us-gaap:PlanName

us-gaap:PerformanceShares, oec:TwoThousandEighteenPlan


None
Period End2020-09-302020-06-302020-03-31
Value0039.24
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.00.0266.2

us-gaap:PerformanceShares, oec:TwoThousandNineteenPlan


None
Period End2020-09-302020-06-302020-03-31
Value0011.48
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.00.077.9

us-gaap:PerformanceShares, oec:TwoThousandSeventeenPlan


None
Period End2020-09-302020-06-302020-03-31
Value0024.89
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.00.0168.9

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage us-gaap:AwardType, us-gaap:Vesting

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage

us-gaap:RestrictedStockUnitsRSU, us-gaap:ShareBasedCompensationAwardTrancheOne


None
Period End2020-09-302020-06-302020-03-31
Value32.99700.3333
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage100.00.0100.0

us-gaap:RestrictedStockUnitsRSU, us-gaap:ShareBasedCompensationAwardTrancheThree


None
Period End2020-09-302020-06-302020-03-31
Value32.99700.3333
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage100.00.0100.0

us-gaap:RestrictedStockUnitsRSU, us-gaap:ShareBasedCompensationAwardTrancheTwo


None
Period End2020-09-302020-06-302020-03-31
Value32.99700.3333
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage100.00.0100.0

us-gaap:StockIssuedDuringPeriodSharesNewIssues us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesNewIssues

us-gaap:CommonStock


None
Period End2020-03-312019-06-30
Value262970.0693710.0
Percentage of StockIssuedDuringPeriodSharesNewIssues100.0100.0

oec:DebtInstrumentCovenantLeverageRatio us-gaap:CreditFacility

oec:DebtInstrumentCovenantLeverageRatio

us-gaap:RevolvingCreditFacility


None
Period End2020-06-302019-04-01
Value2.752.3
Percentage of DebtInstrumentCovenantLeverageRatio100.0100.0

oec:DebtInstrumentCovenantLeverageRatio us-gaap:Range, us-gaap:CreditFacility

srt:Maximum, us-gaap:RevolvingCreditFacility


None
Period End2020-06-302020-03-312019-04-02
Value2.752.752.25
Percentage of DebtInstrumentCovenantLeverageRatio100.00.00.0

srt:Minimum, us-gaap:RevolvingCreditFacility


None
Period End2020-09-302020-06-302020-03-312019-04-02
Value3.42.252.251.75
Percentage of DebtInstrumentCovenantLeverageRatio0.081.80.00.0

oec:GuaranteeObligationsCarryingAmount

oec:GuaranteeObligationsCarryingAmount


None
Period End2020-09-30
Value15
Percentage of GuaranteeObligationsCarryingAmount100.0

oec:GuaranteeObligationsCarryingAmount us-gaap:CounterpartyName

oec:DeutscheBankAG


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value2.22.22.22.9
Percentage of GuaranteeObligationsCarryingAmount0.00.00.00.0

oec:EulerHermesS.A.


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value9.69.49.215
Percentage of GuaranteeObligationsCarryingAmount0.00.00.00.0

oec:LibertyMutualInsurance


None
Period End2020-06-30
Value3.1
Percentage of GuaranteeObligationsCarryingAmount0.0

oec:UnicreditAG


None
Period End2020-06-30
Value0.3
Percentage of GuaranteeObligationsCarryingAmount0.0

oec:LesseeOperatingAndFinanceLeasesLiabilityUndiscountedExcessAmount

oec:LesseeOperatingAndFinanceLeasesLiabilityUndiscountedExcessAmount


None
Period End2020-09-30
Value8130000.0
Percentage of LesseeOperatingAndFinanceLeasesLiabilityUndiscountedExcessAmount100.0

oec:LesseeOperatingLeaseLeaseNotYetCommencedUndiscountedAmount us-gaap:StatementGeographical

oec:LesseeOperatingLeaseLeaseNotYetCommencedUndiscountedAmount

oec:CologneGermany


None
Period End2020-05-312016-10-31
Value6.035
Percentage of LesseeOperatingLeaseLeaseNotYetCommencedUndiscountedAmount100.0100.0

oec:LongTermDebtGrossCurrent us-gaap:CreditFacility, us-gaap:DebtInstrument

oec:LongTermDebtGrossCurrent

oec:TermLoan, oec:TermLoanFacility


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value8254000.08048000.07952000.08057000.08149000.0
Percentage of LongTermDebtGrossCurrent100.0100.0100.0100.0100.0

oec:LongtermDebtExcludingCurrentMaturitiesGross us-gaap:CreditFacility, us-gaap:DebtInstrument

oec:LongtermDebtExcludingCurrentMaturitiesGross

oec:TermLoan, oec:TermLoanFacility


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value643629624634650
Percentage of LongtermDebtExcludingCurrentMaturitiesGross100.0100.0100.0100.0100.0

oec:NumberOfGuaranteesIssuedByCounterparty us-gaap:CounterpartyName

oec:NumberOfGuaranteesIssuedByCounterparty

oec:EulerHermesS.A.


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value5.05.03.04.0
Percentage of NumberOfGuaranteesIssuedByCounterparty100.0100.0100.0100.0

oec:LibertyMutualInsurance


None
Period End2020-06-30
Value1.0
Percentage of NumberOfGuaranteesIssuedByCounterparty20.0

oec:UnicreditAG


None
Period End2020-06-30
Value4.0
Percentage of NumberOfGuaranteesIssuedByCounterparty80.0

oec:OperatingAndFinanceLeaseLiability

oec:OperatingAndFinanceLeaseLiability


None
Period End2020-09-30
Value84
Percentage of OperatingAndFinanceLeaseLiability100.0

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDue

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDue


None
Period End2020-09-30
Value92
Percentage of OperatingAndFinanceLeasesFutureMinimumPaymentsDue100.0

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDueInFiveYears

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDueInFiveYears


None
Period End2020-09-30
Value8989000.0
Percentage of OperatingAndFinanceLeasesFutureMinimumPaymentsDueInFiveYears100.0

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDueInFourYears

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDueInFourYears


None
Period End2020-09-30
Value9529000.0
Percentage of OperatingAndFinanceLeasesFutureMinimumPaymentsDueInFourYears100.0

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDueInThreeYears

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDueInThreeYears


None
Period End2020-09-30
Value10
Percentage of OperatingAndFinanceLeasesFutureMinimumPaymentsDueInThreeYears100.0

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDueInTwoYears

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDueInTwoYears


None
Period End2020-09-30
Value10
Percentage of OperatingAndFinanceLeasesFutureMinimumPaymentsDueInTwoYears100.0

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDueNextTwelveMonths

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDueNextTwelveMonths


None
Period End2020-09-30
Value11
Percentage of OperatingAndFinanceLeasesFutureMinimumPaymentsDueNextTwelveMonths100.0

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDueThereafter

oec:OperatingAndFinanceLeasesFutureMinimumPaymentsDueThereafter


None
Period End2020-09-30
Value40
Percentage of OperatingAndFinanceLeasesFutureMinimumPaymentsDueThereafter100.0

oec:OtherFinancialAssetsCurrent

oec:OtherFinancialAssetsCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value3.29.434191112
Percentage of OtherFinancialAssetsCurrent100.0100.0100.0100.0100.0

oec:OtherFinancialAssetsNoncurrent

oec:OtherFinancialAssetsNoncurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value706000.0715000.0692000.02501000.02723000.0
Percentage of OtherFinancialAssetsNoncurrent100.0100.0100.0100.0100.0

oec:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization

oec:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization


None
Period End2020-03-312019-12-31
Value535534
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization100.0100.0

oec:PurchaseObligationDueInSecondThroughFifthYear

oec:PurchaseObligationDueInSecondThroughFifthYear


None
Period End2020-09-30
Value77
Percentage of PurchaseObligationDueInSecondThroughFifthYear100.0

oec:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedToVestNumber us-gaap:AwardType

oec:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedToVestNumber

us-gaap:PerformanceShares


None
Period End2020-06-302020-03-312019-12-312018-12-312017-12-31
Value279960.0515350.0917260.01556000.01433400.0
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedToVestNumber100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


None
Period End2020-06-302020-03-312019-12-312018-12-312017-12-31
Value194180.0195690.0197580.035817.00
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedToVestNumber69.438.021.52.30.0

oec:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedToVestNumber us-gaap:AwardType, us-gaap:GranteeStatus, us-gaap:PlanName

us-gaap:RestrictedStockUnitsRSU, oec:ShareBasedPaymentArrangementEmployeeExistingEmployees, oec:TwoThousandNineteenPlan


None
Period End2020-06-302020-03-312019-12-31
Value125040.0126550.0128450.0
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedToVestNumber44.724.614.0

oec:SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedToVestNumber us-gaap:AwardType, us-gaap:PlanName

us-gaap:PerformanceShares, oec:TwoThousandEighteenPlan


None
Period End2020-06-302020-03-312019-12-31
Value171900.0299420.0299420.0
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedToVestNumber61.458.132.6

us-gaap:PerformanceShares, oec:TwoThousandNineteenPlan


None
Period End2020-06-302020-03-312019-12-31
Value108060.0215930.0215930.0
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedToVestNumber38.641.923.5

us-gaap:PerformanceShares, oec:TwoThousandSeventeenPlan


None
Period End2020-06-302020-03-312019-12-31
Value00401900.0
Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsExpectedToVestNumber0.00.043.8

us-gaap:AccountsReceivableGrossCurrent

us-gaap:AccountsReceivableGrossCurrent


None
Period End2020-09-302020-06-302019-12-31
Value223151219
Percentage of AccountsReceivableGrossCurrent100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302018-12-31
Value7955000.06379000.07454000.06632000.05348000.05594000.05081000.0
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentFairValue us-gaap:CreditFacility, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DebtInstrumentFairValue

oec:CreditFacilityTermLoan, us-gaap:FairValueInputsLevel2


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value652637632643658
Percentage of DebtInstrumentFairValue100.0100.0100.0100.0100.0

oec:LocalBankLoan, us-gaap:FairValueInputsLevel2


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value1161301382928
Percentage of DebtInstrumentFairValue17.920.421.94.64.3

us-gaap:DebtIssuanceCostsLineOfCreditArrangementsNet us-gaap:CreditFacility

us-gaap:DebtIssuanceCostsLineOfCreditArrangementsNet

us-gaap:RevolvingCreditFacility


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-312017-05-052014-07-25
Value3000000.03100000.03200000.03400000.02400000.02300000.03300000.0
Percentage of DebtIssuanceCostsLineOfCreditArrangementsNet100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtLongtermAndShorttermCombinedAmount

us-gaap:DebtLongtermAndShorttermCombinedAmount


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value763762764666684
Percentage of DebtLongtermAndShorttermCombinedAmount100.0100.0100.0100.0100.0

us-gaap:DeferredFinanceCostsCurrentNet us-gaap:CreditFacility, us-gaap:DebtInstrument

us-gaap:DeferredFinanceCostsCurrentNet

oec:TermLoan, oec:TermLoanFacility


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value1441000.01387000.01366000.01409000.01472000.0
Percentage of DeferredFinanceCostsCurrentNet100.0100.0100.0100.0100.0

us-gaap:DeferredFinanceCostsNet us-gaap:CreditFacility, us-gaap:DebtInstrument

us-gaap:DeferredFinanceCostsNet

oec:TermLoan, oec:TermLoanFacility


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value5300000.05400000.05700000.06100000.07700000.0
Percentage of DeferredFinanceCostsNet100.0100.0100.0100.0100.0

us-gaap:DeferredIncomeTaxAssetsNet

us-gaap:DeferredIncomeTaxAssetsNet


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value6054564852
Percentage of DeferredIncomeTaxAssetsNet100.0100.0100.0100.0100.0

us-gaap:DerivativeAssets us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DerivativeAssets

us-gaap:FairValueInputsLevel2


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value0.0026.43168.4369.949
Percentage of DerivativeAssets100.0100.0100.0100.0100.0

us-gaap:DerivativeAssetsCurrent us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DerivativeAssetsCurrent

us-gaap:FairValueInputsLevel2


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value6.428168.4349.777
Percentage of DerivativeAssetsCurrent100.0100.0100.0100.0

us-gaap:DerivativeAssetsNoncurrent us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DerivativeAssetsNoncurrent

us-gaap:FairValueInputsLevel2


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value2000.02000.06000.01000.0172000.0
Percentage of DerivativeAssetsNoncurrent100.0100.0100.0100.0100.0

us-gaap:DerivativeLiabilities us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DerivativeLiabilities

us-gaap:FairValueInputsLevel2


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value16108.7239.4257.032
Percentage of DerivativeLiabilities100.0100.0100.0100.0100.0

us-gaap:DerivativeLiabilitiesCurrent us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DerivativeLiabilitiesCurrent

us-gaap:FairValueInputsLevel2


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value24000.0342000.049000.0109000.02302000.0
Percentage of DerivativeLiabilitiesCurrent100.0100.0100.0100.0100.0

us-gaap:DerivativeLiabilitiesNoncurrent us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:DerivativeLiabilitiesNoncurrent

us-gaap:FairValueInputsLevel2


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value16108.6759.3164.73
Percentage of DerivativeLiabilitiesNoncurrent100.0100.0100.0100.0100.0

us-gaap:DueFromRelatedParties us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:DueFromRelatedParties

srt:AffiliatedEntity


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value510000.025000.0773000.0537000.0651000.0
Percentage of DueFromRelatedParties100.0100.0100.0100.0100.0

us-gaap:DueToRelatedPartiesCurrentAndNoncurrent us-gaap:RelatedPartyTransactionsByRelatedParty

us-gaap:DueToRelatedPartiesCurrentAndNoncurrent

srt:AffiliatedEntity


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value9.1429.412131718
Percentage of DueToRelatedPartiesCurrentAndNoncurrent100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions


None
Period End2020-09-30
Value7800000.0
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions100.0

us-gaap:EquityMethodInvestments

us-gaap:EquityMethodInvestments


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value5311000.04944000.05235000.05232000.05332000.0
Percentage of EquityMethodInvestments100.0100.0100.0100.0100.0

us-gaap:IncomeTaxesReceivable

us-gaap:IncomeTaxesReceivable


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value10117.8191724
Percentage of IncomeTaxesReceivable100.0100.0100.0100.0100.0

us-gaap:InventoryFinishedGoodsNetOfReserves

us-gaap:InventoryFinishedGoodsNetOfReserves


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value68729195108
Percentage of InventoryFinishedGoodsNetOfReserves100.0100.0100.0100.0100.0

us-gaap:InventoryRawMaterialsNetOfReserves

us-gaap:InventoryRawMaterialsNetOfReserves


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value5662766973
Percentage of InventoryRawMaterialsNetOfReserves100.0100.0100.0100.0100.0

us-gaap:InventoryValuationReserves

us-gaap:InventoryValuationReserves


None
Period End2020-03-312019-12-312019-03-312018-12-31
Value10000000.06700000.06700000.01600000.0
Percentage of InventoryValuationReserves100.0100.0100.0100.0

us-gaap:InventoryWorkInProcessNetOfReserves

us-gaap:InventoryWorkInProcessNetOfReserves


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value201000.0115000.035000.0148000.01246000.0
Percentage of InventoryWorkInProcessNetOfReserves100.0100.0100.0100.0100.0

us-gaap:LineOfCredit us-gaap:CounterpartyName, us-gaap:CreditFacility

us-gaap:LineOfCredit

oec:DeutscheBankAG, us-gaap:RevolvingCreditFacility


None
Period End2020-03-312019-12-31
Value6726
Percentage of LineOfCredit100.0100.0

oec:Unicredit, us-gaap:RevolvingCreditFacility


None
Period End2020-03-31
Value27
Percentage of LineOfCredit40.5

us-gaap:LineOfCredit us-gaap:CreditFacility

oec:AncillaryFacilities


None
Period End2020-09-302020-06-302019-12-31
Value744428
Percentage of LineOfCredit0.00.0108.3

us-gaap:RevolvingCreditFacility


None
Period End2020-06-302020-03-31
Value4443
Percentage of LineOfCredit0.065.2

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:CounterpartyName, us-gaap:CreditFacility

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

oec:RCFBankGroup, oec:AncillaryFacilities


None
Period End2020-06-30
Value170
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0

oec:RCFBankGroup, oec:June2020AncillaryFacilities


None
Period End2020-06-30
Value40
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity23.5

oec:RCFBankGroup, us-gaap:RevolvingCreditFacility


None
Period End2020-09-302020-06-30
Value293250
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity0.0147.1

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


None
Period End2020-09-302019-12-312019-03-312019-01-01
Value84293131
Percentage of OperatingLeaseLiability100.0100.0100.0100.0

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent


None
Period End2020-09-30
Value5.7
Percentage of OperatingLeaseWeightedAverageDiscountRatePercent100.0

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value947000.0905000.0886000.0908000.0855000.0
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization

us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization


None
Period End2020-09-302020-06-302019-12-31
Value577556534
Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization100.0100.0100.0

us-gaap:PurchaseObligation

us-gaap:PurchaseObligation


None
Period End2020-09-30
Value186
Percentage of PurchaseObligation100.0

us-gaap:PurchaseObligationDueInNextTwelveMonths

us-gaap:PurchaseObligationDueInNextTwelveMonths


None
Period End2020-09-30
Value108
Percentage of PurchaseObligationDueInNextTwelveMonths100.0

us-gaap:RestrictedCash

us-gaap:RestrictedCash


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value2859000.02734000.02675000.04505000.04356000.04537000.04504000.04588000.02929000.0
Percentage of RestrictedCash100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestructuringReserve

us-gaap:RestructuringReserve


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312016-12-31
Value1.8262.5723.2214.7658.6588.71716
Percentage of RestructuringReserve100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestructuringReserve us-gaap:RestructuringCostAndReserve

oec:GroundRemediationCostsRelatedToRestructuring


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312016-12-31
Value0.030.0750.2210.4882.9394.3173.795
Percentage of RestructuringReserve1.62.96.910.233.949.522.8

us-gaap:EmployeeSeverance


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312016-12-31
Value1.6662.3732.8053.42.3340.6466.453
Percentage of RestructuringReserve91.292.387.171.427.07.438.7

us-gaap:FacilityClosing


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312016-12-31
Value0.0790.0750.1470.5612.5412.8244.88
Percentage of RestructuringReserve4.32.94.611.829.332.429.3

us-gaap:OtherRestructuring


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312016-12-31
Value0.0510.0490.0480.3170.8440.931.547
Percentage of RestructuringReserve2.81.91.56.79.710.79.3

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedIntrinsicValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedIntrinsicValue

us-gaap:PerformanceShares


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value12.5110.597.4619.316.7121.4118.9925.2832.130.8527.125.6
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedIntrinsicValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value12.5110.597.4619.316.7121.4118.9925.2832.130.8527.125.6
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedIntrinsicValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

us-gaap:PerformanceShares


None
Period End2020-06-302020-03-312019-12-312018-12-312017-12-312016-12-31
Value578050.0580650.01003700.01595000.01610900.01145200.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


None
Period End2020-06-302020-03-312019-12-312018-12-312017-12-312016-12-31
Value194180.0195690.0197580.035817.000
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber33.633.719.72.20.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber us-gaap:AwardType, us-gaap:GranteeStatus, us-gaap:PlanName

us-gaap:RestrictedStockUnitsRSU, oec:ShareBasedPaymentArrangementEmployeeExistingEmployees, oec:TwoThousandNineteenPlan


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value125040.0126550.0128450.00
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber21.621.812.80.0

us-gaap:RestrictedStockUnitsRSU, oec:ShareBasedPaymentArrangementEmployeeNewHireSignOn, oec:TwoThousandEighteenPlan


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value23878.023878.023878.035817.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber4.14.12.42.2

us-gaap:RestrictedStockUnitsRSU, oec:ShareBasedPaymentArrangementEmployeeNewHireSignOn, oec:TwoThousandNineteenPlan


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value45257.045257.045257.00
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber7.87.84.50.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber us-gaap:AwardType, us-gaap:PlanName

us-gaap:PerformanceShares, oec:TwoThousandEighteenPlan


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value351720.0352820.0355770.0450030.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber60.860.835.428.2

us-gaap:PerformanceShares, oec:TwoThousandNineteenPlan


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value226320.0227830.0229730.00
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber39.239.222.90.0

us-gaap:PerformanceShares, oec:TwoThousandSeventeenPlan


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value00418250.0467350.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber0.00.041.729.3

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding us-gaap:AwardType

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding

us-gaap:PerformanceShares


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value158.25.823221831415141
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


None
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value158.25.823221831415141
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ShortTermBorrowings

us-gaap:ShortTermBorrowings


None
Period End2020-09-302020-06-302020-03-312019-12-312018-12-31
Value1161301382934
Percentage of ShortTermBorrowings100.0100.0100.0100.0100.0

us-gaap:ShortTermBorrowings us-gaap:StatementGeographical, us-gaap:CreditFacility

country:BR, us-gaap:LineOfCredit


None
Period End2020-09-302020-06-302019-12-31
Value1.41.10.0
Percentage of ShortTermBorrowings1.20.80.0

country:KR, us-gaap:LineOfCredit


None
Period End2020-09-302020-06-302019-12-31
Value40390.0
Percentage of ShortTermBorrowings34.830.30.0

us-gaap:TreasuryStockShares

us-gaap:TreasuryStockShares


None
Period End2020-06-302020-03-312019-12-312018-12-31
Value505140.0505140.0505140.0517080.0
Percentage of TreasuryStockShares100.0100.0100.0100.0

Line plots across dimensions of each concept


Operating Margin
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
None
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
None
us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)
None
us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:PlanName
(None,)
None
us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:IncomeStatementLocation
(None,)
None
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
None
us-gaap:LongTermDebt
us-gaap:CreditFacility, us-gaap:DebtInstrument
('oec:TermLoan', None)
None
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
None