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Pension Plans (Schedule of Fair Values of Investments) (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities | $ 9,536.5 | $ 8,542.2
Equity securities | 184.8 | 157.7
Investments Net Asset Value [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturities | 245.9 | 250.1
Equity securities | 32.9 | 33.9
Total investment assets at fair value | $ 278.8 | $ 284.0

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