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| 2024-12-31 | 2024-09-30 | 2024-06-30 | 2024-03-31 | 2023-12-31 | 2023-09-30 | 2023-06-30 | 2023-03-31 | 2022-12-31 | 2022-09-30 | 2022-06-30 | 2022-03-31 | 2021-12-31 | 2021-09-30 | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Common Stock Value | 0.23 | NA | NA | NA | 0.23 | NA | NA | NA | 0.23 | NA | NA | NA | 0.23 | NA | NA | NA | 0.23 | NA | NA | NA | 0.22 | NA | NA | NA | 0.21 | NA | NA | NA | 0.21 | NA | NA | NA | 0.21 | 0.21 | 0.00 | NA | 0.00 | NA | NA | NA | |
| Common Stock Par Or Stated Value Per Share | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | NA | NA | 0.00 | NA | NA | NA | |
| dei: Entity Common Stock Shares Outstanding | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| Weighted Average Number Of Diluted Shares Outstanding | NA | 23.34 | 23.33 | 23.34 | NA | 23.32 | 23.30 | 23.29 | NA | 23.11 | 23.10 | 23.09 | NA | 23.06 | 23.05 | 23.07 | NA | 22.93 | 22.71 | 22.68 | NA | 22.28 | 21.83 | 21.76 | NA | 21.72 | 21.67 | 21.63 | NA | 21.52 | 21.46 | 21.39 | NA | 20.74 | NA | NA | NA | 0.00 | NA | NA | |
| Weighted Average Number Of Shares Outstanding Basic | NA | 23.18 | 23.16 | 23.11 | NA | 23.06 | 23.04 | 23.01 | NA | 22.81 | 22.78 | 22.75 | NA | 22.71 | 22.68 | 22.66 | NA | 22.40 | 22.15 | 22.11 | NA | 21.66 | 21.21 | 21.17 | NA | 21.10 | 21.07 | 21.05 | NA | 21.00 | 20.97 | 20.97 | NA | 20.66 | NA | NA | NA | 0.00 | NA | NA | |
| Earnings Per Share Basic | 4.71 | 4.93 | 4.00 | 4.28 | 4.48 | 3.30 | 3.16 | 2.43 | 2.94 | 1.45 | 1.19 | 1.40 | 2.13 | 1.61 | 1.57 | 1.42 | 1.69 | 0.66 | 1.37 | 0.23 | 0.81 | 0.60 | 0.65 | 0.88 | 0.21 | 0.57 | 0.48 | 0.35 | 0.28 | 0.20 | 0.41 | 0.30 | 0.33 | 0.24 | 0.00 | 0.00 | NA | 0.00 | NA | NA | |
| Earnings Per Share Diluted | 4.68 | 4.90 | 3.97 | 4.24 | 4.43 | 3.26 | 3.12 | 2.40 | 2.90 | 1.43 | 1.17 | 1.38 | 2.09 | 1.59 | 1.55 | 1.39 | 1.65 | 0.65 | 1.33 | 0.22 | 0.79 | 0.58 | 0.63 | 0.86 | 0.20 | 0.55 | 0.47 | 0.34 | 0.27 | 0.20 | 0.40 | 0.29 | 0.32 | 0.24 | 0.00 | 0.00 | NA | 0.00 | NA | NA |
| 2024-12-31 | 2024-09-30 | 2024-06-30 | 2024-03-31 | 2023-12-31 | 2023-09-30 | 2023-06-30 | 2023-03-31 | 2022-12-31 | 2022-09-30 | 2022-06-30 | 2022-03-31 | 2021-12-31 | 2021-09-30 | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Revenues | 412.12 | 418.06 | 384.55 | 372.79 | 351.17 | 314.37 | 295.77 | 256.94 | 242.96 | 216.96 | 178.96 | 180.32 | 183.60 | 164.88 | 153.01 | 138.28 | 139.33 | 122.50 | 117.71 | 80.35 | 92.80 | 78.33 | 72.57 | 72.19 | 56.90 | 60.14 | 54.95 | 50.13 | 50.74 | 47.84 | 45.51 | 42.69 | 40.35 | 34.87 | 33.68 | 32.72 | 24.38 | 19.84 | 18.59 | 17.79 | |
| Realized Investment Gains Losses | NA | -0.01 | 2.88 | 3.87 | NA | 4.27 | 1.29 | -4.65 | NA | -0.17 | 1.41 | 0.29 | NA | 0.90 | 0.30 | 1.20 | NA | 0.65 | 0.25 | 0.78 | NA | 0.18 | -0.23 | 0.28 | NA | -0.01 | 0.17 | 0.11 | NA | 0.04 | 0.02 | -0.03 | NA | 0.00 | -0.00 | 0.39 | NA | -0.01 | 0.01 | NA | |
| Premiums Earned Net | 359.74 | 348.75 | 332.46 | 309.52 | 296.83 | 281.50 | 257.05 | 237.16 | 216.14 | 209.26 | 190.16 | 178.56 | 165.27 | 156.87 | 137.70 | 123.04 | 117.79 | 108.24 | 96.96 | 89.76 | 82.78 | 72.62 | 66.09 | 61.49 | 59.44 | 54.30 | 50.89 | 48.06 | 47.54 | 45.03 | 43.05 | 40.43 | 38.46 | 32.97 | 31.78 | 30.60 | 22.59 | 18.28 | 17.02 | NA | |
| Net Investment Income | 41.86 | 39.64 | 35.85 | 32.93 | 30.38 | 27.09 | 24.17 | 20.70 | 17.74 | 13.86 | 10.59 | 9.09 | 8.58 | 8.10 | 7.43 | 6.94 | 6.50 | 7.01 | 6.64 | 5.96 | 5.55 | 5.26 | 4.81 | 4.51 | 4.59 | 4.08 | 3.78 | 3.23 | 3.09 | 2.77 | 2.43 | 2.29 | 2.10 | 1.89 | 1.82 | 1.68 | 1.62 | 1.44 | 1.38 | NA | |
| Gain Loss On Investments | 0.09 | -0.01 | 2.88 | 3.87 | 5.13 | 4.27 | 1.29 | -4.65 | -0.34 | -0.17 | 1.41 | 0.29 | 0.43 | 0.90 | 0.30 | 1.20 | 1.86 | 0.65 | 0.25 | 0.78 | 0.13 | 0.18 | -0.23 | 0.28 | 0.00 | -0.01 | 0.17 | 0.11 | 0.12 | 0.04 | 0.02 | -0.03 | -0.21 | 0.00 | -0.00 | 0.39 | NA | NA | NA | NA | |
| Other Income | 0.35 | 0.52 | 0.74 | 0.32 | 0.34 | 0.34 | 0.43 | 0.31 | 0.32 | 0.11 | 0.14 | 0.12 | 0.15 | 0.04 | 0.01 | 0.01 | 0.04 | 0.57 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.08 | 0.06 | 0.13 | 0.13 | 0.19 | NA | |
| Interest Expense Debt | 2.56 | 2.59 | 2.56 | 2.42 | 2.43 | 2.57 | 2.72 | 2.57 | 1.98 | 1.72 | 0.34 | 0.25 | 0.25 | 0.24 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| Allocated Share Based Compensation Expense | 3.40 | 3.50 | 3.70 | 3.50 | 2.50 | 2.40 | 2.50 | 2.00 | 1.70 | 1.70 | 1.80 | 1.50 | 1.20 | 1.30 | 1.30 | 1.00 | 0.90 | 1.00 | 0.90 | 0.80 | 0.80 | 0.80 | 0.60 | 0.50 | 0.50 | 0.50 | 0.40 | 0.20 | 0.20 | 0.20 | NA | NA | 0.20 | NA | NA | NA | 0.00 | NA | NA | NA | |
| Income Tax Expense Benefit | 29.56 | 30.17 | 23.22 | 16.93 | 26.63 | 19.38 | 17.32 | 12.59 | 16.90 | 7.12 | 5.35 | 7.08 | 11.76 | 9.05 | 7.97 | 7.36 | 4.64 | 1.23 | 6.18 | -0.06 | 3.67 | 2.22 | 2.77 | 4.08 | 0.66 | 2.15 | 2.35 | 1.53 | 5.30 | 1.05 | 4.26 | 3.00 | 3.43 | 4.11 | 3.20 | 2.63 | 2.28 | 3.01 | 3.37 | NA | |
| Net Income Loss | 109.09 | 114.23 | 92.58 | 98.94 | 103.39 | 76.11 | 72.79 | 55.80 | 67.25 | 32.98 | 27.09 | 31.79 | 48.32 | 36.62 | 35.63 | 32.08 | 38.18 | 14.89 | 30.26 | 5.09 | 17.85 | 12.98 | 13.77 | 18.72 | 4.45 | 11.94 | 10.11 | 7.29 | 5.92 | 4.20 | 8.49 | 6.28 | 6.87 | 7.98 | 6.06 | 5.26 | 4.60 | 5.94 | 6.61 | 5.12 | |
| Comprehensive Income Net Of Tax | 58.64 | 177.69 | 86.92 | 89.00 | 163.80 | 52.60 | 58.68 | 73.31 | 79.67 | -13.67 | -27.79 | -32.14 | 41.18 | 30.55 | 45.22 | 12.46 | 41.70 | 21.44 | 57.27 | -4.14 | 16.05 | 16.22 | 20.32 | 25.50 | 6.80 | 9.99 | 9.10 | 2.43 | 7.42 | 5.84 | 10.67 | 7.35 | 1.22 | 7.98 | 8.95 | 7.38 | 4.14 | 6.06 | 4.64 | 5.87 |
| 2024-12-31 | 2024-09-30 | 2024-06-30 | 2024-03-31 | 2023-12-31 | 2023-09-30 | 2023-06-30 | 2023-03-31 | 2022-12-31 | 2022-09-30 | 2022-06-30 | 2022-03-31 | 2021-12-31 | 2021-09-30 | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Assets | 4886.70 | 4732.24 | 4395.29 | 4031.29 | 3772.97 | 3442.54 | 3270.20 | 2997.82 | 2747.12 | 2464.23 | 2198.12 | 2114.55 | 2025.65 | 1898.89 | 1806.28 | 1645.34 | 1546.90 | 1468.59 | 1289.35 | 1165.49 | 1090.55 | 1036.45 | 894.81 | 852.87 | 773.06 | 770.50 | 728.90 | 687.77 | 667.85 | 662.99 | 622.97 | 594.46 | 614.39 | 663.27 | 563.59 | NA | 545.28 | NA | NA | NA | |
| Liabilities | 3403.14 | 3297.29 | 3138.09 | 2860.32 | 2686.14 | 2518.77 | 2398.39 | 2182.09 | 2001.67 | 1844.78 | 1564.05 | 1448.98 | 1326.32 | 1239.73 | 1176.64 | 1057.77 | 970.66 | 934.46 | 833.23 | 764.15 | 684.67 | 646.41 | 586.90 | 563.98 | 509.08 | 512.60 | 480.96 | 447.92 | 429.66 | 431.24 | 396.92 | 377.98 | 404.18 | 453.39 | 433.77 | NA | 431.83 | NA | NA | NA | |
| Liabilities And Stockholders Equity | 4886.70 | 4732.24 | 4395.29 | 4031.29 | 3772.97 | 3442.54 | 3270.20 | 2997.82 | 2747.12 | 2464.23 | 2198.12 | 2114.55 | 2025.65 | 1898.89 | 1806.28 | 1645.34 | 1546.90 | 1468.59 | 1289.35 | 1165.49 | 1090.55 | 1036.45 | 894.81 | 852.87 | 773.06 | 770.50 | 728.90 | 687.77 | 667.85 | 662.99 | 622.97 | 594.46 | 614.39 | 663.27 | 563.59 | NA | 545.28 | NA | NA | NA | |
| Stockholders Equity | 1483.56 | 1434.95 | 1257.20 | 1170.97 | 1086.83 | 923.76 | 871.82 | 815.73 | 745.45 | 619.46 | 634.07 | 665.57 | 699.34 | 659.16 | 629.64 | 587.57 | 576.24 | 534.13 | 456.11 | 401.33 | 405.88 | 390.04 | 307.91 | 288.89 | 263.99 | 257.90 | 247.94 | 239.85 | 238.19 | 231.76 | 226.04 | 216.47 | 210.21 | 209.88 | 129.82 | 120.84 | 113.45 | 109.22 | 103.15 | NA |
| 2024-12-31 | 2024-09-30 | 2024-06-30 | 2024-03-31 | 2023-12-31 | 2023-09-30 | 2023-06-30 | 2023-03-31 | 2022-12-31 | 2022-09-30 | 2022-06-30 | 2022-03-31 | 2021-12-31 | 2021-09-30 | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cash And Cash Equivalents At Carrying Value | NA | 111.69 | 171.02 | 136.13 | 126.69 | 162.94 | 125.06 | 158.65 | 156.27 | 126.21 | 120.89 | NA | 121.04 | NA | NA | NA | 77.09 | NA | NA | NA | 100.41 | 86.31 | 78.13 | 102.87 | 75.09 | 64.74 | 79.67 | 56.66 | 81.75 | 96.68 | 93.43 | 75.56 | 50.75 | 103.76 | 22.24 | 25.98 | 24.54 | 28.18 | 19.09 | NA | |
| Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents | 113.21 | 111.69 | 171.02 | 136.13 | 126.69 | 162.94 | 125.06 | 158.65 | 156.27 | 126.21 | 120.89 | 104.16 | 121.04 | 90.01 | 128.00 | 132.53 | 77.09 | 78.70 | 62.98 | 52.55 | 100.41 | 86.31 | 78.13 | 102.87 | 75.09 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| Equity Securities Fv Ni | 398.36 | 365.63 | 317.48 | 287.65 | 234.81 | 207.95 | 196.85 | 171.37 | 152.47 | 133.74 | 139.54 | 163.57 | 172.61 | 151.79 | 150.88 | 140.04 | 129.66 | 116.01 | 107.91 | 83.57 | 78.29 | 65.92 | 65.91 | 64.48 | 57.71 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| 2024-12-31 | 2024-09-30 | 2024-06-30 | 2024-03-31 | 2023-12-31 | 2023-09-30 | 2023-06-30 | 2023-03-31 | 2022-12-31 | 2022-09-30 | 2022-06-30 | 2022-03-31 | 2021-12-31 | 2021-09-30 | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Property Plant And Equipment Gross | 100.29 | 88.94 | 82.04 | 78.26 | 74.97 | 72.88 | 65.98 | 64.42 | 61.77 | 59.61 | 56.89 | 55.57 | 54.87 | 53.82 | 52.43 | 50.51 | 49.45 | 48.41 | 46.66 | 36.76 | 26.51 | NA | NA | NA | 5.30 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| Accumulated Depreciation Depletion And Amortization Property Plant And Equipment | 17.37 | 15.25 | 13.88 | 12.65 | 11.56 | 10.62 | 9.81 | 9.03 | 8.29 | 7.58 | 6.88 | 6.22 | 5.57 | 4.94 | 4.35 | 3.76 | 3.26 | 4.60 | 4.27 | 4.07 | 3.87 | NA | NA | NA | 3.19 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| Property Plant And Equipment Net | 82.92 | 73.69 | 68.16 | 65.61 | 63.40 | 62.26 | 56.17 | 55.40 | 53.48 | 52.03 | 50.00 | 49.34 | 49.30 | 48.88 | 48.07 | 46.75 | 46.19 | 43.81 | 42.39 | 32.68 | 22.63 | NA | NA | NA | 2.11 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| Equity Securities Fv Ni | 398.36 | 365.63 | 317.48 | 287.65 | 234.81 | 207.95 | 196.85 | 171.37 | 152.47 | 133.74 | 139.54 | 163.57 | 172.61 | 151.79 | 150.88 | 140.04 | 129.66 | 116.01 | 107.91 | 83.57 | 78.29 | 65.92 | 65.91 | 64.48 | 57.71 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| 2024-12-31 | 2024-09-30 | 2024-06-30 | 2024-03-31 | 2023-12-31 | 2023-09-30 | 2023-06-30 | 2023-03-31 | 2022-12-31 | 2022-09-30 | 2022-06-30 | 2022-03-31 | 2021-12-31 | 2021-09-30 | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Long Term Debt | 184.12 | 184.05 | 183.98 | 183.91 | 183.85 | 183.78 | 195.88 | 195.81 | 195.75 | 123.16 | NA | NA | 42.70 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| 2024-12-31 | 2024-09-30 | 2024-06-30 | 2024-03-31 | 2023-12-31 | 2023-09-30 | 2023-06-30 | 2023-03-31 | 2022-12-31 | 2022-09-30 | 2022-06-30 | 2022-03-31 | 2021-12-31 | 2021-09-30 | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Stockholders Equity | 1483.56 | 1434.95 | 1257.20 | 1170.97 | 1086.83 | 923.76 | 871.82 | 815.73 | 745.45 | 619.46 | 634.07 | 665.57 | 699.34 | 659.16 | 629.64 | 587.57 | 576.24 | 534.13 | 456.11 | 401.33 | 405.88 | 390.04 | 307.91 | 288.89 | 263.99 | 257.90 | 247.94 | 239.85 | 238.19 | 231.76 | 226.04 | 216.47 | 210.21 | 209.88 | 129.82 | 120.84 | 113.45 | 109.22 | 103.15 | NA | |
| Common Stock Value | 0.23 | NA | NA | NA | 0.23 | NA | NA | NA | 0.23 | NA | NA | NA | 0.23 | NA | NA | NA | 0.23 | NA | NA | NA | 0.22 | NA | NA | NA | 0.21 | NA | NA | NA | 0.21 | NA | NA | NA | 0.21 | 0.21 | 0.00 | NA | 0.00 | NA | NA | NA | |
| Additional Paid In Capital | NA | 357.94 | 354.39 | 351.58 | 352.97 | 350.45 | 347.87 | 347.22 | 347.01 | 297.69 | 295.66 | 296.39 | 295.04 | 293.54 | 292.05 | 292.69 | 291.31 | 288.87 | 230.26 | 230.74 | 229.23 | 227.66 | 159.99 | 159.59 | 158.49 | 157.72 | 156.26 | 155.78 | 155.08 | 154.81 | 153.68 | 153.51 | 153.35 | 153.19 | 80.27 | NA | 80.23 | NA | NA | NA | |
| Additional Paid In Capital Common Stock | 361.40 | NA | NA | NA | 352.97 | NA | NA | NA | 347.01 | NA | NA | NA | 295.04 | NA | NA | NA | 291.31 | NA | NA | NA | 229.23 | NA | NA | NA | 158.49 | NA | NA | NA | 155.08 | NA | NA | NA | 153.35 | NA | NA | NA | 80.23 | NA | NA | NA | |
| Retained Earnings Accumulated Deficit | 1229.14 | 1123.53 | 1012.80 | 923.71 | 828.25 | 728.11 | 655.23 | 585.69 | 533.12 | 468.87 | 438.87 | 414.76 | 385.94 | 340.13 | 306.02 | 272.89 | 243.31 | 207.18 | 194.32 | 166.07 | 162.91 | 146.83 | 135.63 | 123.56 | 106.55 | 103.58 | 93.13 | 84.50 | 73.50 | 68.84 | 65.90 | 58.66 | 53.64 | 47.82 | 40.88 | NA | 29.57 | NA | NA | NA | |
| Accumulated Other Comprehensive Income Loss Net Of Tax | -97.21 | -46.75 | -110.22 | -104.56 | -94.62 | -155.03 | -131.52 | -117.41 | -134.92 | -147.34 | -100.69 | -45.80 | 18.12 | 25.27 | 31.34 | 21.76 | 41.38 | 37.86 | 31.30 | 4.29 | 13.52 | 15.32 | 12.08 | 5.52 | -1.26 | -3.61 | -1.66 | -0.64 | 9.39 | 7.90 | 6.26 | 4.08 | 3.01 | 8.67 | 8.67 | NA | 3.65 | NA | NA | NA | |
| Treasury Stock Value | 10.00 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value | NA | 3.50 | 3.71 | 3.52 | NA | 2.42 | 2.54 | 1.99 | NA | 1.66 | 1.86 | 1.49 | NA | 1.26 | 1.28 | 1.04 | NA | 0.95 | 0.93 | 0.81 | NA | 0.81 | 0.62 | 0.51 | 0.51 | 0.52 | 0.40 | 0.16 | 0.16 | 0.17 | 0.16 | 0.16 | 0.16 | 0.28 | 0.04 | 0.01 | 0.01 | 0.01 | NA | NA |
| 2024-12-31 | 2024-09-30 | 2024-06-30 | 2024-03-31 | 2023-12-31 | 2023-09-30 | 2023-06-30 | 2023-03-31 | 2022-12-31 | 2022-09-30 | 2022-06-30 | 2022-03-31 | 2021-12-31 | 2021-09-30 | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Net Cash Provided By Used In Operating Activities | 212.98 | 274.03 | 278.93 | 210.36 | 211.53 | 224.73 | 225.97 | 197.60 | 101.12 | 178.04 | 156.72 | 121.93 | 105.16 | 106.93 | 103.63 | 91.32 | 73.51 | 73.87 | 72.90 | 59.68 | 59.26 | 47.81 | 37.49 | 33.80 | 25.57 | 27.98 | 28.99 | 21.44 | 12.85 | 23.77 | 25.34 | 15.45 | NA | 20.12 | 20.31 | 16.17 | NA | NA | NA | NA | |
| Net Cash Provided By Used In Investing Activities | -198.03 | -329.94 | -239.65 | -192.51 | -244.53 | -171.75 | -254.41 | -190.21 | -188.72 | -249.75 | -134.39 | -135.71 | -71.87 | -142.65 | -103.71 | -33.72 | -77.05 | -120.78 | -68.06 | -113.55 | -49.66 | -116.19 | -60.02 | -4.92 | -14.00 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| Net Cash Provided By Used In Financing Activities | -13.43 | -3.43 | -4.39 | -8.41 | -3.25 | -15.10 | -5.16 | -5.02 | 117.67 | 77.03 | -5.60 | -3.10 | -2.26 | -2.28 | -4.45 | -2.16 | 1.93 | 62.62 | 5.58 | 6.01 | 4.50 | 76.56 | -2.21 | -1.10 | -1.23 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| 2024-12-31 | 2024-09-30 | 2024-06-30 | 2024-03-31 | 2023-12-31 | 2023-09-30 | 2023-06-30 | 2023-03-31 | 2022-12-31 | 2022-09-30 | 2022-06-30 | 2022-03-31 | 2021-12-31 | 2021-09-30 | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Net Cash Provided By Used In Operating Activities | 212.98 | 274.03 | 278.93 | 210.36 | 211.53 | 224.73 | 225.97 | 197.60 | 101.12 | 178.04 | 156.72 | 121.93 | 105.16 | 106.93 | 103.63 | 91.32 | 73.51 | 73.87 | 72.90 | 59.68 | 59.26 | 47.81 | 37.49 | 33.80 | 25.57 | 27.98 | 28.99 | 21.44 | 12.85 | 23.77 | 25.34 | 15.45 | NA | 20.12 | 20.31 | 16.17 | NA | NA | NA | NA | |
| Net Income Loss | 109.09 | 114.23 | 92.58 | 98.94 | 103.39 | 76.11 | 72.79 | 55.80 | 67.25 | 32.98 | 27.09 | 31.79 | 48.32 | 36.62 | 35.63 | 32.08 | 38.18 | 14.89 | 30.26 | 5.09 | 17.85 | 12.98 | 13.77 | 18.72 | 4.45 | 11.94 | 10.11 | 7.29 | 5.92 | 4.20 | 8.49 | 6.28 | 6.87 | 7.98 | 6.06 | 5.26 | 4.60 | 5.94 | 6.61 | 5.12 |
| 2024-12-31 | 2024-09-30 | 2024-06-30 | 2024-03-31 | 2023-12-31 | 2023-09-30 | 2023-06-30 | 2023-03-31 | 2022-12-31 | 2022-09-30 | 2022-06-30 | 2022-03-31 | 2021-12-31 | 2021-09-30 | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Net Cash Provided By Used In Investing Activities | -198.03 | -329.94 | -239.65 | -192.51 | -244.53 | -171.75 | -254.41 | -190.21 | -188.72 | -249.75 | -134.39 | -135.71 | -71.87 | -142.65 | -103.71 | -33.72 | -77.05 | -120.78 | -68.06 | -113.55 | -49.66 | -116.19 | -60.02 | -4.92 | -14.00 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| Payments To Acquire Property Plant And Equipment | 10.79 | 5.83 | 3.82 | 3.51 | 1.11 | 1.28 | 1.56 | 2.66 | 2.16 | 2.72 | 1.32 | 0.70 | 1.15 | 1.82 | 1.66 | 1.28 | 3.79 | 8.97 | 10.85 | 9.26 | 7.22 | 6.41 | 2.07 | 3.92 | 0.65 | 0.16 | 0.36 | 0.09 | 0.08 | 0.04 | 0.03 | 0.03 | 0.19 | 0.14 | 0.11 | 0.12 | 0.06 | 0.08 | NA | NA |
| 2024-12-31 | 2024-09-30 | 2024-06-30 | 2024-03-31 | 2023-12-31 | 2023-09-30 | 2023-06-30 | 2023-03-31 | 2022-12-31 | 2022-09-30 | 2022-06-30 | 2022-03-31 | 2021-12-31 | 2021-09-30 | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Net Cash Provided By Used In Financing Activities | -13.43 | -3.43 | -4.39 | -8.41 | -3.25 | -15.10 | -5.16 | -5.02 | 117.67 | 77.03 | -5.60 | -3.10 | -2.26 | -2.28 | -4.45 | -2.16 | 1.93 | 62.62 | 5.58 | 6.01 | 4.50 | 76.56 | -2.21 | -1.10 | -1.23 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| Payments Of Dividends Common Stock | NA | 3.48 | 3.49 | 3.50 | NA | 3.23 | 3.26 | 3.24 | NA | 2.97 | 3.01 | 2.96 | NA | 2.50 | 2.53 | 2.50 | NA | 2.03 | 2.02 | 1.99 | NA | 1.76 | 1.71 | 1.70 | NA | 1.48 | 1.48 | 1.47 | NA | 1.26 | 1.26 | 1.26 | NA | 1.05 | 0.00 | 0.00 | NA | NA | NA | NA |
| 2024-12-31 | 2024-09-30 | 2024-06-30 | 2024-03-31 | 2023-12-31 | 2023-09-30 | 2023-06-30 | 2023-03-31 | 2022-12-31 | 2022-09-30 | 2022-06-30 | 2022-03-31 | 2021-12-31 | 2021-09-30 | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Revenues | 412.12 | 418.06 | 384.55 | 372.79 | 351.17 | 314.37 | 295.77 | 256.94 | 242.96 | 216.96 | 178.96 | 180.32 | 183.60 | 164.88 | 153.01 | 138.28 | 139.33 | 122.50 | 117.71 | 80.35 | 92.80 | 78.33 | 72.57 | 72.19 | 56.90 | 60.14 | 54.95 | 50.13 | 50.74 | 47.84 | 45.51 | 42.69 | 40.35 | 34.87 | 33.68 | 32.72 | 24.38 | 19.84 | 18.59 | 17.79 |
