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Pension and Other Postretirement Benefit Plans - Components of Net Periodic Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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] $ (0.3) $ (2.1) $ 0.0
Service Cost 3.3 3.9 4.7
Interest Cost [1] 5.0 7.3 7.1
Expected Return on Plan Assets [1] (9.7) (10.5) (10.9)
Amortization of Loss [1] 1.0 0.5 0.8
Amortization of Prior Service Cost [1] (8.0) (2.8) (2.1)
Net Pension Cost (8.7) (3.7) (0.4)
Pension [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Service Cost 10.7 9.3 11.0
Interest Cost [2] 27.9 31.9 29.6
Expected Return on Plan Assets [2] (42.7) (44.2) (44.4)
Amortization of Loss [2] 12.8 7.5 11.4
Amortization of Prior Service Cost [2] (0.2) (0.1) (0.1)
Net Pension Cost $ 8.5 $ 4.4 $ 7.5
[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.