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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Credit loss impairments | $ (0.4) | $ (3.1) |  | $ (8.1) |
Intent-to-sell impairments | (6.7) | (7.6) |  | (2.3) |
Total impairments | (7.1) | (10.7) |  | (10.4) |
Sales and other, net | (25.0) | (17.8) |  | 4.3 |
Change in fair value - equity securities | 7.9 | (33.2) |  | (2.3) |
Change in fair value and losses realized on settlements - derivatives | 0.2 | 5.2 |  | (2.6) |
Net investment losses | $ (24.0) | $ (56.5) | [1] | $ (11.0) | [1]
[1] | Recast for the adoption of ASU 2018-12. See Note 1 of the Consolidated Financial Statements

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