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Investments - Net Investment Gains (Losses) by Transaction Type (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Credit loss impairments | $ 0.9 | $ (0.5) | $ 0.0 | $ (0.5)
Intent-to-sell impairments | 0.0 | (6.1) | 0.0 | (6.1)
Total impairments | 0.9 | (6.6) | 0.0 | (6.6)
Sales and other, net | (3.2) | (19.3) | (3.3) | (21.7)
Change in fair value - equity securities | (2.1) | 7.7 | 0.5 | 6.7
Change in fair value and gains (losses) realized on settlements - derivatives | (1.5) | 0.8 | (0.9) | 0.3
Net investment gains (losses) | $ (5.9) | $ (17.4) | $ (3.7) | $ (21.3)

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- Definition Other than Temporary Impairment Losses, Investments, Portion Recognized In Earnings, Change In Intent + References No definition available. + Details
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