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Pension and Other Postretirement Benefit Plans - Obligation and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Change in Plan Assets      
Non-Current Liabilities $ (118.2) $ (160.8)  
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated Benefit Obligation 701.7 729.5  
Change in Benefit Obligation [Roll Forward]      
Obligation, Beginning of Year 746.3 739.7  
Service Cost 6.6 6.5 $ 9.3
Interest Cost 38.6 40.5 27.2
Actuarial (Gain) Loss (17.1) 13.9  
Benefits Paid (61.9) (60.9)  
Participant Contributions 7.0 6.6  
Obligation, End of Year 719.5 746.3 739.7
Change in Plan Assets      
Fair Value, Beginning of Year 589.0 568.6  
Actual Return on Plan Assets 43.0 55.1  
Employer Contribution 34.0 26.2  
Benefits Paid (61.9) (60.9)  
Fair Value, End of Year 604.1 589.0 568.6
Funded Status, End of Year (115.4) (157.3)  
Current Liabilities (1.9) (2.1)  
Non-Current Liabilities (113.5) (155.2)  
Postretirement Health and Life Obligation and Funded Status      
Change in Benefit Obligation [Roll Forward]      
Obligation, Beginning of Year 73.9 110.4  
Service Cost 1.5 2.0 3.0
Interest Cost 3.9 5.6 4.4
Actuarial (Gain) Loss (1.9) (9.3)  
Benefits Paid (6.4) (8.1)  
Participant Contributions 1.4 2.4  
Plan Amendments 0.0 (29.1)  
Obligation, End of Year 72.4 73.9 110.4
Change in Plan Assets      
Fair Value, Beginning of Year 173.8 162.6  
Actual Return on Plan Assets 14.8 20.3  
Employer Contribution (Withdrawal) (9.4) (3.4)  
Participant Contributions 1.4 2.4  
Benefits Paid (6.4) (8.1)  
Fair Value, End of Year 174.2 173.8 $ 162.6
Funded Status, End of Year 101.8 99.9  
Non-Current Assets 107.6 106.3  
Current Liabilities (0.2) (0.2)  
Non-Current Liabilities $ (5.6) $ (6.2)