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Investments - Net Investment Losses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Net investment losses | $ (24.0) | $ (56.5) | [1] | $ (11.0) | [1]
Fixed maturity securities |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Net investment losses | (20.3) | (29.1) |  | (7.7) |
Equity securities |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Net investment losses | (3.9) | (32.6) |  | (0.8) |
Short-term and other investments |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Net investment losses | $ 0.2 | $ 5.2 |  | $ (2.5) |
[1] | Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements

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