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Investment Income and Gains and Losses (Proceeds from Sales of Available for Sale Fixed Maturities) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |
Proceeds from sales | $ 1,452.9 | $ 1,844.1 | $ 168.8
Gross gains | 2.4 | 2.5 | 1.0
Gross losses | $ 64.6 | $ 91.3 | $ 10.5

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