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Postretirement Health Care and Life Insurance Benefits - Reconciliation of Postretirement Plans' Funded Status to the Balance Sheet (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2023
Jan. 01, 2022
Change in plan assets:          
Average remaining service period (in years)       1 year 10 months 24 days 2 years 10 months 24 days
Postretirement Health Care and Life Insurance Benefits          
Change in benefit obligation:          
Accumulated postretirement benefit obligation at beginning of period $ 258.7 $ 476.6      
Service cost 0.8 1.0 $ 3.8    
Interest cost 7.0 10.5 20.2    
Participant contributions 0.0 0.1      
Plan amendments 0.0 139.5 185.4    
Benefits paid (21.2) (34.5)      
Actuarial gain (55.4) (55.5)      
Accumulated postretirement benefit obligation at end of period 189.9 258.7 476.6    
Change in plan assets:          
Fair value of plan assets at beginning of period 26.1 33.7      
Actual return on plan assets (3.4) 0.0      
Employer contributions 15.9 26.8      
Participant contributions 0.0 0.1      
Benefits paid and administrative fees (net of Medicare Part D reimbursements) (21.2) (34.5)      
Fair value of plan assets at end of period 17.4 26.1 33.7    
Funded status at end of period (172.5) (232.6)      
Less: Current portion (included in “Accounts payable and accrued expenses”) 16.0 20.5      
Noncurrent obligation (included in “Accrued postretirement benefit costs”) $ (156.5) (212.1)      
Average remaining service period (in years)       13 years 14 years
Postretirement Health Care and Life Insurance Benefits | Retirement Plan Amendment One          
Change in benefit obligation:          
Plan amendments     $ 174.5    
Change in plan assets:          
Average remaining service period (in years)       2 years 10 months 24 days 3 years 10 months 24 days
Postretirement Health Care and Life Insurance Benefits | Retirement Plan Amendment Two          
Change in benefit obligation:          
Plan amendments   $ 10.9      
Change in plan assets:          
Average remaining service period (in years)       8 years 6 months 9 years 6 months