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Pension and Other Postretirement Benefit Plans - Components of Net Periodic Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement [1] $ (2.1) $ 0.0 $ 0.0
Service Cost 3.9 4.7 4.4
Interest Cost [1] 7.3 7.1 7.7
Expected Return on Plan Assets [1] (10.5) (10.9) (10.5)
Amortization of Loss [1] 0.5 0.8 0.3
Amortization of Prior Service Cost [1] (2.8) (2.1) (2.0)
Net Pension Cost (3.7) (0.4) (0.1)
Pension [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Service Cost 9.3 11.0 10.2
Interest Cost [2] 31.9 29.6 32.5
Expected Return on Plan Assets [2] (44.2) (44.4) (42.4)
Amortization of Loss [2] 7.5 11.4 9.9
Amortization of Prior Service Cost [2] (0.1) (0.1) 0.0
Net Pension Cost $ 4.4 $ 7.5 $ 10.2
[1]
These components of net periodic postretirement health and life cost are included in the line item “Other” under Other Income (Expense) on the Consolidated Statement of Income.
[2]
These components of net periodic pension cost are included in the line item “Other” under Other Income (Expense) on the Consolidated Statement of Income.