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Investments - Net Investment Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Gain (Loss) on Securities |  |  |  |
Net investment losses | $ (17.4) | $ (15.5) | $ (21.3) | $ (31.0)
Fixed maturity securities |  |  |  |
Gain (Loss) on Securities |  |  |  |
Net investment losses | (14.7) | (2.9) | (17.1) | (5.2)
Equity securities |  |  |  |
Gain (Loss) on Securities |  |  |  |
Net investment losses | (3.5) | (12.6) | (4.5) | (28.1)
Short-term investments and other |  |  |  |
Gain (Loss) on Securities |  |  |  |
Net investment losses | $ 0.8 | $ 0.0 | $ 0.3 | $ 2.3

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