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Pension and Postretirement Health and Life Benefits (Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Plan, Defined Benefit [Member]      
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax $ (0.1) $ (0.7) $ (0.9)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax (0.1) (0.7) (0.9)
Total recognized in net periodic benefit costs (income) and other comprehensive income (loss), pre-tax (26.6) 20.0 (66.8)
Other Postretirement Benefits Plan [Member]      
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax (1.8) (1.9) (2.0)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax (1.8) (1.9) (2.0)
Total recognized in net periodic benefit costs (income) and other comprehensive income (loss), pre-tax $ 4.4 $ (25.5) $ (1.0)