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Pension and Postretirement Health and Life Benefits (Schedule of Changes in Projected Benefit Obligations) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement $ (7.2) $ 4.0  
Defined Benefit Plan, Plan Assets, Amount 633.0 621.2  
Pension Plan, Defined Benefit [Member]      
Defined Benefit Plan, Benefit Obligation 757.9 763.5 $ 733.8
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement 56.7 59.8  
Defined Benefit Plan, Service Cost 3.5 3.3  
Defined Benefit Plan, Interest Cost 24.3 30.3  
Defined Benefit Plan, Benefit Obligation, Benefits Paid (56.8) (59.1)  
Defined Benefit Plan, Benefit Obligation, Increase for Plan Amendment 0.0 (1.3)  
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement (30.4) 0.0  
Defined Benefit Plan, Benefit Obligation, Administrative Expenses Paid (2.9) (3.3)  
Defined Benefit Plan, Plan Assets, Amount 633.1 621.2 563.5
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 85.4 109.3  
Defined Benefit Plan, Plan Assets, Contributions by Employer 16.6 10.8  
Defined Benefit Plan, Funded (Unfunded) Status of Plan (124.8) (142.3)  
Amounts Recognized In Current Liabilities (0.4) (0.5)  
Amounts Recognized In Noncurrent Liabilities (124.4) (141.8)  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position (124.8) (142.3)  
Recognized In Accumulated Other Comprehensive Income Pre Tax Prior Service Cost Credit (1.1) (1.3)  
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax $ (1.1) $ (1.3)  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 2.50% 3.30%  
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan, Benefit Obligation $ 142.4 $ 152.8 151.6
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement (1.6) 9.1  
Defined Benefit Plan, Service Cost 0.0 0.0  
Defined Benefit Plan, Interest Cost 4.8 6.0  
Defined Benefit Plan, Benefit Obligation, Benefits Paid (13.6) (13.9)  
Defined Benefit Plan, Benefit Obligation, Increase for Plan Amendment 0.0 0.0  
Defined Benefit Plan, Benefit Obligation, Administrative Expenses Paid 0.0 0.0  
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0 $ 0.0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 0.0 0.0  
Defined Benefit Plan, Plan Assets, Contributions by Employer 13.6 13.9  
Defined Benefit Plan, Funded (Unfunded) Status of Plan (142.4) (152.8)  
Amounts Recognized In Current Liabilities (11.6) (14.2)  
Amounts Recognized In Noncurrent Liabilities (130.8) (138.6)  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position (142.4) (152.8)  
Recognized In Accumulated Other Comprehensive Income Pre Tax Prior Service Cost Credit (2.1) (2.3)  
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax $ (2.1) $ 0.1  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 2.50% 3.30%  
Plan paid [Member] | Pension Plan, Defined Benefit [Member]      
Defined Benefit Plan, Benefit Obligation, Benefits Paid $ (56.3) $ (59.1)  
Plan paid [Member] | Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan, Benefit Obligation, Benefits Paid (13.6) (13.9)  
Company paid [Member] | Pension Plan, Defined Benefit [Member]      
Defined Benefit Plan, Benefit Obligation, Benefits Paid $ (0.5) $ 0.0