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Postretirement Health Care and Life Insurance Benefits - Reconciliation of Postretirement Plans' Funded Status to the Balance Sheet (Details) - Postretirement Health Care and Life Insurance Benefits - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Change in benefit obligation:      
Projected benefit obligation at beginning of period $ 178.0 $ 189.9  
Service cost 0.5 0.5 $ 0.8
Interest cost 9.1 10.2 7.0
Plan amendments (6.5) 0.0  
Benefits Paid and Administrative Fees (18.8) (20.9)  
Actuarial gain (16.9) (1.7)  
Projected benefit obligation at end of period 145.4 178.0 189.9
Change in plan assets:      
Fair value of plan assets at beginning of period 14.3 17.4  
Actual return on plan assets 0.5 1.5  
Employer contributions 15.3 16.3  
Benefits paid and administrative fees (net of Medicare Part D reimbursements) (18.8) (20.9)  
Fair value of plan assets at end of period 11.3 14.3 $ 17.4
Funded status at end of period (134.1) (163.7)  
Less: Current portion (included in “Accounts payable and accrued expenses”) 13.7 15.3  
Noncurrent obligation (included in “Other noncurrent liabilities”) $ 120.4 $ 148.4