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Postretirement Health Care and Life Insurance Benefits - Estimated Future Benefit Payments (Details) - USD ($)
$ in Millions
Jan. 01, 2023
Dec. 31, 2022
Jan. 01, 2022
Defined Benefit Plan Disclosure [Line Items]      
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      
Defined Benefit Plan Disclosure [Line Items]      
2023   $ 23.1  
2024   22.3  
2025   21.1  
2026   20.1  
2027   18.9  
Years 2028-2032   $ 75.7  
Average remaining service period (in years) 13 years   14 years
Postretirement Health Care and Life Insurance Benefits | Retirement Plan Amendment One      
Defined Benefit Plan Disclosure [Line Items]      
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      
Defined Benefit Plan Disclosure [Line Items]      
Average remaining service period (in years) 8 years 6 months   9 years 6 months