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Investment Income and Gains and Losses (Schedule of Allowance for Credit Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |  |
Allowance for credit losses as of the beginning of the period | $ 5.7 | $ 10.0
Reductions for disposals | (0.5) | (3.6)
Reductions for writedowns |  | (3.0)
Additional credit losses on investments for which an allowance was previously recognized | 2.9 | 2.3
Allowance for credit losses as of the end of the period | $ 8.1 | $ 5.7

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