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Income from Investments - Net Impairment Losses Recognized in Earnings (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Net Investment Income [Line Items] |  |  |
Impairment Losses | $ (5.8) | $ (1.1) | $ (25.8)
Available for sale, debt securities, other than temporary impairment loss | 3.3 | 2.0 | 23.8
Fixed Maturities: |  |  |
Net Investment Income [Line Items] |  |  |
Impairment Losses | (4.8) | (0.1) | (25.8)
Equity Securities |  |  |
Net Investment Income [Line Items] |  |  |
Impairment Losses | (0.4) | (0.5) | 0.0
Real Estate |  |  |
Net Investment Income [Line Items] |  |  |
Impairment Losses | (0.4) | 0.0 | 0.0
Other Long-Term Investments |  |  |
Net Investment Income [Line Items] |  |  |
Impairment Losses | $ (0.2) | $ (0.5) | $ 0.0

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