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Pension and Other Retiree Benefits - Projected Benefit Obligations in Excess of Plan Assets (Details) - Pension - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation $ 162.6 $ 162.3
Fair value of plan assets 145.5 140.2
International    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 442.1 411.3
Fair value of plan assets $ 297.2 $ 273.7