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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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