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Pension and Other Postretirement Benefit Plans - Components of Net Periodic Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Service Cost $ 3.6 $ 3.3 $ 3.9
Interest Cost [1] 4.4 5.0 7.3
Expected Return on Plan Assets [1] (9.9) (9.7) (10.5)
Amortization of Loss [1] 3.0 1.0 0.5
Amortization of Prior Service Cost [1] (7.6) (8.0) (2.8)
Effect of Plan Curtailment [1] 0.0 (0.3) (2.1)
Net Pension Cost (6.5) (8.7) (3.7)
Pension [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Service Cost 11.0 10.7 9.3
Interest Cost [2] 24.6 27.9 31.9
Expected Return on Plan Assets [2] (43.4) (42.7) (44.2)
Amortization of Loss [2] 18.8 12.8 7.5
Amortization of Prior Service Cost [2] (0.2) (0.2) (0.1)
Net Pension Cost $ 10.8 $ 8.5 $ 4.4
[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.