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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, 2017
Dec. 31, 2016
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax $ (0.1) $ (0.3)
Pension Plan, Defined Benefit [Member]    
Total recognized in net periodic benefit costs (income) and other comprehensive income (loss), pre-tax (15.7) 8.1
Other Postretirement Benefit Plan, Defined Benefit [Member]    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax 0.0  
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax 0.1  
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax 0.1 3.9
Total recognized in net periodic benefit costs (income) and other comprehensive income (loss), pre-tax $ (7.7) $ 2.0