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Investments - Net Investment Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Gain (Loss) on Securities |  |  |  |
Net investment gains (losses) | $ 3.8 | $ (8.4) | $ 0.1 | $ (29.7)
Fixed maturity securities |  |  |  |
Gain (Loss) on Securities |  |  |  |
Net investment gains (losses) | (0.3) | (3.4) | (3.6) | (20.5)
Equity securities |  |  |  |
Gain (Loss) on Securities |  |  |  |
Net investment gains (losses) | 5.1 | (2.1) | 5.6 | (6.6)
Short-term investments and other |  |  |  |
Gain (Loss) on Securities |  |  |  |
Net investment gains (losses) | $ (1.0) | $ (2.9) | $ (1.9) | $ (2.6)

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