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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Components of Net Periodic Benefit Cost (Income) [Abstract]        
Employer Contributions to Defined Benefit Pension Plans - Common Stock Value     $ 0.0 $ 13.5
Pension [Member]        
Components of Net Periodic Benefit Cost (Income) [Abstract]        
Service Cost $ 2.8 $ 2.6 5.5 5.1
Interest Cost 7.4 8.2 14.8 [1] 16.3 [1]
Expected Return on Plan Assets (11.1) (10.6) (22.1) [1] (21.2) [1]
Amortization of Prior Service Credits 0.0 0.0 0.0 [1] 0.0 [1]
Amortization of Net Loss 3.0 2.4 6.0 [1] 4.9 [1]
Net Periodic Benefit Cost 2.1 2.6 4.2 5.1
Employer Contributions to Defined Benefit Pension Plans - Common Stock Value       13.5
Employer Contributions to Defined Benefit Plans     15.0 1.7
Expected Future Employer Contributions in 2018 0.0   0.0  
Other Postretirement [Member]        
Components of Net Periodic Benefit Cost (Income) [Abstract]        
Service Cost 1.3 1.1 2.5 2.2
Interest Cost 1.8 1.9 3.6 [1] 3.8 [1]
Expected Return on Plan Assets (2.8) (2.7) (5.5) [1] (5.3) [1]
Amortization of Prior Service Credits (0.5) (0.5) (0.9) [1] (1.0) [1]
Amortization of Net Loss 0.2 0.1 0.4 [1] 0.2 [1]
Net Periodic Benefit Cost 0.0 $ (0.1) 0.1 (0.1)
Employer Contributions to Defined Benefit Plans     0.0 $ 0.0
Expected Future Employer Contributions in 2018 $ 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.