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Investments - (Schedule of Allowance for Credit Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Allowance for credit losses as of the beginning of the period | $ 8.6 | $ 8.5 | $ 10.0 | $ 3.2
Reductions for writedowns |  |  | (3.0) |
Reductions for disposals | (1.3) |  | (1.6) |
Additional credit losses on investments for which an allowance was previously recognized | 0.2 |  | 2.1 | 5.4
Recoveries |  |  |  | (0.1)
Allowance for credit losses as of the end of the period | $ 7.5 | $ 8.5 | $ 7.5 | $ 8.5

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