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Postretirement and Other Benefits - Funded Status (Details) - Pension Benefits - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
United States      
Change in Projected Benefit Obligation, or PBO:      
PBO at beginning of year $ 119.9 $ 112.3  
Service cost 0.0 0.0 $ 0.0
Interest cost 3.7 4.6 4.3
Actuarial loss 9.7 11.1  
Participant contributions 0.0 0.0  
Gross benefits paid (8.2) (8.1)  
Currency translation effect 0.0 0.0  
PBO at end of year 125.1 119.9 112.3
Change in Plan Assets:      
Fair value of plan assets at beginning of year 125.8 113.1  
Actual return on plan assets 16.8 20.8  
Employer contributions 0.0 0.0  
Participant contributions 0.0 0.0  
Gross benefits paid (8.2) (8.1)  
Currency translation effect 0.0 0.0  
Fair value of plan assets at end of year 134.4 125.8 113.1
Funded status at end of year 9.3 5.9  
France      
Change in Projected Benefit Obligation, or PBO:      
PBO at beginning of year 31.9 29.5  
Service cost 1.3 1.0 1.1
Interest cost 0.2 0.4 0.4
Actuarial loss 0.6 3.2  
Participant contributions 0.5 0.7  
Gross benefits paid (1.7) (2.3)  
Currency translation effect 3.0 (0.6)  
PBO at end of year 35.8 31.9 29.5
Change in Plan Assets:      
Fair value of plan assets at beginning of year 1.1 2.1  
Actual return on plan assets 0.0 0.2  
Employer contributions 1.2 1.1  
Participant contributions 0.0 0.0  
Gross benefits paid (1.6) (2.3)  
Currency translation effect 0.1 0.0  
Fair value of plan assets at end of year 0.8 1.1 $ 2.1
Funded status at end of year $ (35.0) $ (30.8)