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Postretirement and Other Benefits (Details) - Pension Benefits - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
U.S. Pension Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 0.0 $ 0.0 $ 0.0 $ 0.0
Interest cost 0.7 1.0 1.4 1.9
Expected return on plan assets (1.0) (1.3) (2.0) (2.5)
Amortizations and other 0.9 0.8 1.8 1.6
Net periodic benefit cost 0.6 0.5 1.2 1.0
French Pension Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 0.4 0.3 0.7 0.6
Interest cost 0.1 0.1 0.1 0.1
Expected return on plan assets 0.0 0.0 0.0 0.0
Amortizations and other 0.2 0.1 0.5 0.4
Net periodic benefit cost 0.7 0.5 1.3 1.1
UK Pension Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 0.0 0.0 0.0 0.0
Interest cost 0.8 0.0 0.8 0.0
Expected return on plan assets (0.9) 0.0 (0.9) 0.0
Amortizations and other 0.0 0.0 0.0 0.0
Net periodic benefit cost $ (0.1) $ 0.0 $ (0.1) $ 0.0