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Pension and Other Retiree Benefits (Accumulated Benefit Obligations in Excess of Plan Assets) (Details) - Pension - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated benefit obligation $ 226.1 $ 211.6
Fair value of plan assets 170.6 158.0
International    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated benefit obligation 716.0 638.4
Fair value of plan assets $ 463.7 $ 417.5