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Postretirement and Other Benefits - Net Pension Benefit Costs (Details) - Pension Benefits - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
U.S.      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 0.0 $ 0.0 $ 0.0
Interest cost 2.8 3.7 4.6
Expected return on plan assets (3.9) (4.9) (5.8)
Amortizations and other 3.2 3.3 2.0
Net periodic benefit cost 2.1 2.1 0.8
France      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost 1.6 1.3 1.0
Interest cost 0.1 0.2 0.4
Expected return on plan assets 0.0 (0.1) (0.1)
Amortizations and other 0.8 1.0 0.9
Net periodic benefit cost 2.5 2.4 2.2
U.K.      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost 0.0 0.0 0.0
Interest cost 2.5 0.0 0.0
Expected return on plan assets (2.7) 0.0 0.0
Amortizations and other 0.0 0.0 0.0
Net periodic benefit cost $ (0.2) $ 0.0 $ 0.0