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Employee Retirement Benefits - Accumulated Benefit Plan Obligation in Excess of Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Pension    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Projected benefit obligations $ 134.3 $ 168.4
Accumulated benefit obligations 134.3 168.4
Fair value of plan assets 112.9 156.4
Postretirement    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Projected benefit obligations 0.8 1.0
Accumulated benefit obligations 0.0 0.0
Fair value of plan assets $ 0.0 $ 0.0