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Income Taxes - Comprehensive Income Tax Benefit and Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Tax Disclosure [Abstract] |  |  |
Income Tax Expense (Benefit) | $ 76.0 | $ (74.8) | $ (84.4)
Unrealized (Depreciation) Appreciation on Securities | 42.2 | (50.3) | 325.5
Tax Effects from Postretirement Benefit Plans | 0.3 | (12.4) | (4.0)
Tax Effects on changes in Discount Rate for Life Reserves | (58.3) | 21.2 | (289.9)
Tax Effects from Cash Flow Hedge | 0.8 | 0.0 | (1.2)
Comprehensive Income (Loss), Tax | $ 91.0 | $ (33.3) | $ (114.8)

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