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Investments - Net Investment Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Gain (Loss) on Securities |  |  |  |
Net investment gains (losses) | $ (5.9) | $ (17.4) | $ (3.7) | $ (21.3)
Fixed maturity securities |  |  |  |
Gain (Loss) on Securities |  |  |  |
Net investment gains (losses) | (2.3) | (14.7) | (3.3) | (17.1)
Equity securities |  |  |  |
Gain (Loss) on Securities |  |  |  |
Net investment gains (losses) | (2.1) | (3.5) | 0.5 | (4.5)
Short-term investments and other |  |  |  |
Gain (Loss) on Securities |  |  |  |
Net investment gains (losses) | $ (1.5) | $ 0.8 | $ (0.9) | $ 0.3

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