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Investments - Net Investment Gains (Losses) By Transaction Type (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |  |  |
Credit loss impairments | $ (8.1) | $ 0.0 | $ (1.1)
Intent-to-sell impairments | (2.3) | (5.3) | (0.3)
Total impairments on investments recognized in net income | (10.4) | (5.3) | (1.4)
Sales and other, net | 4.3 | 15.0 | 151.5
Change in fair value - equity securities | (2.3) | (0.2) | 7.3
Change in fair value and losses realized on settlements - derivatives | (2.6) | (11.8) | (4.1)
Net investment (losses) gains | $ (11.0) | $ (2.3) | $ 153.3

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