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Investments - Net Investment Gains (Losses) by Transaction Type (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Credit loss impairments | $ (0.5) | $ (1.3) | $ (0.5) | $ (2.2)
Intent-to-sell impairments | (6.1) | (0.5) | (6.1) | (1.4)
Total impairments | (6.6) | (1.8) | (6.6) | (3.6)
Sales and other, net | (19.3) | (1.1) | (21.7) | 0.0
Change in fair value - equity securities | 7.7 | (12.6) | 6.7 | (29.7)
Change in fair value and gains (losses) realized on settlements - derivatives | 0.8 | 0.0 | 0.3 | 2.3
Net investment losses | $ (17.4) | $ (15.5) | $ (21.3) | $ (31.0)

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