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Postretirement and Other Benefits - Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
United States | Pension Benefits      
Change in Projected Benefit Obligation, or PBO:      
PBO at beginning of year $ 112.3 $ 124.1  
Service cost 0.0 0.0 $ 0.0
Interest cost 4.6 4.3 4.8
Actuarial loss (gain) 11.1 (8.2)  
Participant contributions 0.0 0.0  
Gross benefits paid (8.1) (7.9)  
Currency translation effect 0.0 0.0  
PBO at end of year 119.9 112.3 124.1
Change in Plan Assets:      
Fair value of plan assets at beginning of year 113.1 128.7  
Actual return on plan assets 20.8 (7.6)  
Employer contributions 0.0 0.0  
Participant contributions 0.0 0.0  
Gross benefits paid (8.1) (8.0)  
Currency translation effect 0.0 0.0  
Fair value of plan assets at end of year 125.8 113.1 128.7
Funded status at end of year 5.9 0.8  
United States | OPEB Benefits      
Change in Projected Benefit Obligation, or PBO:      
PBO at beginning of year 1.2 1.4  
Service cost 0.0 0.0 0.0
Interest cost 0.1 0.1 0.1
Actuarial loss (gain) 0.1 (0.2)  
Participant contributions 0.1 0.1  
Gross benefits paid (0.1) (0.2)  
Currency translation effect 0.0 0.0  
PBO at end of year 1.4 1.2 1.4
Change in Plan Assets:      
Fair value of plan assets at beginning of year 0.0 0.0  
Actual return on plan assets 0.0 0.0  
Employer contributions 0.0 0.0  
Participant contributions 0.1 0.2  
Gross benefits paid (0.1) (0.2)  
Currency translation effect 0.0 0.0  
Fair value of plan assets at end of year 0.0 0.0 0.0
Funded status at end of year (1.4) (1.2)  
France | Pension Benefits      
Change in Projected Benefit Obligation, or PBO:      
PBO at beginning of year 29.5 30.5  
Service cost 1.0 1.1 1.1
Interest cost 0.4 0.4 0.4
Actuarial loss (gain) 3.2 0.9  
Participant contributions 0.7 1.0  
Gross benefits paid (2.3) (3.0)  
Currency translation effect (0.6) (1.4)  
PBO at end of year 31.9 29.5 30.5
Change in Plan Assets:      
Fair value of plan assets at beginning of year 2.1 3.2  
Actual return on plan assets 0.2 (0.7)  
Employer contributions 1.1 1.2  
Participant contributions 0.0 0.0  
Gross benefits paid (2.3) (1.5)  
Currency translation effect 0.0 (0.1)  
Fair value of plan assets at end of year 1.1 2.1 $ 3.2
Funded status at end of year $ (30.8) $ (27.4)