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Employee Retirement Benefits - Changes in Projected Benefit Obligation, Changes in Plan Assets and Funded Status of Plan (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension      
Change in Projected Benefit Obligations      
Benefit obligations at beginning of year $ 168.4 $ 176.8  
Interest cost 4.5 4.1 $ 5.1
Plan settlements (10.8) (5.9)  
Benefits paid (0.3) (0.3)  
Actuarial gain (27.5) (6.3)  
Benefit obligations at end of year 134.3 168.4 176.8
Change in Fair Value of Plan Assets      
Fair value of plan assets at beginning of year 156.4 157.5  
Actual return on plan assets (32.4) 5.1  
Plan settlements (10.8) (5.9)  
Benefits paid (0.3) (0.3)  
Fair value of plan assets at end of year 112.9 156.4 157.5
Funded Status (21.4) (12.0)  
Accumulated benefit obligations 134.3 168.4  
Postretirement      
Change in Projected Benefit Obligations      
Benefit obligations at beginning of year 1.0 1.1  
Interest cost 0.1 0.0  
Plan settlements 0.0 0.0  
Benefits paid 0.0 0.0  
Actuarial gain (0.3) (0.1)  
Benefit obligations at end of year 0.8 1.0 1.1
Change in Fair Value of Plan Assets      
Fair value of plan assets at beginning of year 0.0 0.0  
Actual return on plan assets 0.0 0.0  
Plan settlements 0.0 0.0  
Benefits paid 0.0 0.0  
Fair value of plan assets at end of year 0.0 0.0 $ 0.0
Funded Status $ (0.8) $ (1.0)