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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, 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