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Postretirement and Other Benefits - PBO and ABO in Excess of Fair Value of Plan Assets (Details) - Pension Benefits - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
U.S.      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
PBO $ 118.4 $ 125.1  
ABO 118.4 125.1  
Fair value of plan assets 124.7 134.4 $ 125.8
France      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
PBO 36.0 35.8  
ABO 36.0 35.8  
Fair value of plan assets 0.5 0.8 1.1
U.K.      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
PBO 192.3 0.0  
ABO 192.3 0.0  
Fair value of plan assets $ 210.1 $ 0.0 $ 0.0