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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
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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)

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