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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, 2020 | Dec. 31, 2019
Pension Plan, Defined Benefit [Member] |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | $ (1.1) | $ (1.3)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | (1.1) | (1.3)
Total recognized in net periodic benefit costs (income) and other comprehensive income (loss), pre-tax | (2.1) | (17.2)
Other Postretirement Benefits Plan [Member] |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | (2.1) | 0.1
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | (2.1) | 0.1
Total recognized in net periodic benefit costs (income) and other comprehensive income (loss), pre-tax | $ (0.9) | $ 15.1

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