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Pension and Other Postretirement Benefit Plans - Obligation and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Change in Plan Assets [Roll Forward]      
Non-Current Liabilities $ (179.5) $ (225.8)  
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net Loss [1] 12.7 (23.0)  
Change in Benefit Obligation [Roll Forward]      
Obligation, Beginning of Year 167.6 149.8  
Service Cost 3.6 3.3 $ 3.9
Interest Cost [2] 4.4 5.0 7.3
Actuarial (Gain) Loss [3] (19.7) 19.2  
Benefits Paid (10.6) (12.6)  
Participant Contributions 2.9 3.2  
Plan Curtailments 0.0 (0.3)  
Obligation, End of Year 148.2 167.6 149.8
Change in Plan Assets [Roll Forward]      
Fair Value, Beginning of Year 186.0 173.7  
Actual Return on Plan Assets 22.8 20.9  
Employer Contribution 0.7 0.8  
Defined Benefit Plan Contributions by Plan Participants, Excluding Key Employees 2.9 3.2  
Benefits Paid (10.6) (12.6)  
Fair Value, End of Year 201.8 186.0 173.7
Funded Status, End of Year 53.6 18.4  
Non-Current Assets 64.8 34.2  
Current Liabilities (1.4) (0.6)  
Non-Current Liabilities (9.8) (15.2)  
Pension [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net Loss (260.2) (299.0)  
Accumulated Benefit Obligation 875.5 931.2  
Change in Benefit Obligation [Roll Forward]      
Obligation, Beginning of Year 965.7 854.0  
Service Cost 11.0 10.7 9.3
Interest Cost [4] 24.6 27.9 31.9
Actuarial (Gain) Loss [5] (39.0) 118.7  
Benefits Paid (56.5) (54.4)  
Participant Contributions 7.3 8.8  
Plan Curtailments (1.4) 0.0  
Obligation, End of Year 911.7 965.7 854.0
Change in Plan Assets [Roll Forward]      
Fair Value, Beginning of Year 759.4 699.6  
Actual Return on Plan Assets 23.1 93.0  
Employer Contribution [6] 19.7 21.2  
Benefits Paid (56.5) (54.4)  
Fair Value, End of Year 745.7 759.4 $ 699.6
Funded Status, End of Year (166.0) (206.3)  
Current Liabilities (2.1) (2.2)  
Non-Current Liabilities $ (163.9) $ (204.1)  
[1] Excludes gains, losses and contributions associated with irrevocable grantor trusts.
[2] 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.
[3] Actuarial (gain) loss was primarily the result of increases in discount rates in 2021 compared to decreases in 2020.
[4] These components of net periodic pension cost are included in the line item “Other” under Other Income (Expense) on the Consolidated Statement of Income.
[5] Actuarial (gain) loss was primarily the result of increases in discount rates in 2021 compared to decreases in 2020.
[6] Includes Participant Contributions noted above.