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Investments - Net Investment Losses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Gain (Loss) on Securities [Line Items] |  |  |  |
Net investment losses | $ (17.3) | $ (24.0) | $ (56.5) | [1]
Fixed maturity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net investment losses | (21.1) | (20.3) | (29.1) |
Equity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net investment losses | 7.4 | (3.9) | (32.6) |
Short-term and other investments |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net investment losses | $ (3.6) | $ 0.2 | $ 5.2 |
[1] | Recast for the adoption of ASU 2018-12.

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