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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Pension [Member]    
Components of Net Periodic Benefit Cost (Income) [Abstract]    
Service Cost $ 2.3 $ 2.7
Interest Cost [1] 8.0 7.4
Expected Return on Plan Assets [1] (11.0) (11.0)
Amortization of Prior Service Credits [1] 0.0 0.0
Amortization of Net Loss [1] 1.8 3.0
Net Periodic Benefit Cost 1.1 2.1
Employer Contributions to Defined Benefit Plans 10.4 15.0
Other Postretirement [Member]    
Components of Net Periodic Benefit Cost (Income) [Abstract]    
Service Cost 1.0 1.2
Interest Cost [1] 1.9 1.8
Expected Return on Plan Assets [1] (2.6) (2.7)
Amortization of Prior Service Credits [1] (0.4) (0.4)
Amortization of Net Loss [1] 0.1 0.2
Net Periodic Benefit Cost 0.0 0.1
Employer Contributions to Defined Benefit Plans $ 0.0 $ 0.0
[1] These components of net periodic benefit cost are included in the line item “Other” under Other Income (Expense) on the Consolidated Statement of Income.