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Income from Investments - Net Realized Gains on Sales of Investments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Equity Securities: |  |  |
Realized Investment Gains | $ 28.6 | $ 6.7 | $ 41.3
Realized Investment Losses | (7.5) | (13.4) | (38.7)
Net Realized Investment Gains (Losses) | 13.2 | (18.6) | 4.3
Fixed Maturities: |  |  |
Fixed Maturities: |  |  |
Gains on Sales | 20.2 | 5.9 | 31.6
Losses on Sales | (3.2) | (10.9) | (31.9)
Equity Securities |  |  |
Equity Securities: |  |  |
Gains on Sales | 4.2 | 0.6 | 9.7
Losses on Sales | (0.1) | (2.5) | (6.8)
Derivative |  |  |
Equity Securities: |  |  |
(Losses) Gains on Hedging Activity | (7.9) | (11.9) | 1.7
Other Long-Term Investments |  |  |
Equity Securities: |  |  |
Realized Investment Gains | 4.2 | 0.2 | 0.0
Realized Investment Losses | $ (4.2) | $ 0.0 | $ 0.0

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