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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, 2018 | Dec. 31, 2017
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | $ (0.2) | $ (0.1)
Pension Plan, Defined Benefit [Member] |  |
Total recognized in net periodic benefit costs (income) and other comprehensive income (loss), pre-tax | 21.5 | (15.7)
Other Postretirement Benefits Plan [Member] |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | 0.2 | 0.1
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | 0.2 | 0.1
Total recognized in net periodic benefit costs (income) and other comprehensive income (loss), pre-tax | $ (7.3) | $ (7.7)

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