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Postretirement and Other Benefits - Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
United States | Pension Benefits      
Change in Projected Benefit Obligation, or PBO:      
PBO at beginning of year $ 124.1 $ 123.2  
Service cost 0.0 0.0 $ 0.0
Interest cost 4.3 4.8 5.2
Actuarial (gain) loss (8.2) 3.9  
Participant contributions 0.0 0.0  
Gross benefits paid (7.9) (7.8)  
Currency translation effect 0.0 0.0  
PBO at end of year 112.3 124.1 123.2
Change in Plan Assets:      
Fair value of plan assets at beginning of year 128.7 118.9  
Actual return on plan assets (7.6) 17.6  
Employer contributions 0.0 0.0  
Participant contributions 0.0 0.0  
Gross benefits paid (8.0) (7.8)  
Currency translation effect 0.0 0.0  
Fair value of plan assets at end of year 113.1 128.7 118.9
Funded status at end of year 0.8 4.6  
United States | OPEB Benefits      
Change in Projected Benefit Obligation, or PBO:      
PBO at beginning of year 1.4 1.4  
Service cost 0.0 0.0 0.0
Interest cost 0.1 0.1 0.1
Actuarial (gain) loss (0.2) 0.2  
Participant contributions 0.1 0.1  
Gross benefits paid (0.2) (0.4)  
Currency translation effect 0.0 0.0  
PBO at end of year 1.2 1.4 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 0.3  
Participant contributions 0.2 0.1  
Gross benefits paid (0.2) (0.4)  
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 (1.2) (1.4)  
France | Pension Benefits      
Change in Projected Benefit Obligation, or PBO:      
PBO at beginning of year 30.5 32.4  
Service cost 1.1 1.1 1.0
Interest cost 0.4 0.4 0.4
Actuarial (gain) loss 0.9 (2.6)  
Participant contributions 1.0 0.0  
Gross benefits paid (3.0) (5.7)  
Currency translation effect (1.4) 4.9  
PBO at end of year 29.5 30.5 32.4
Change in Plan Assets:      
Fair value of plan assets at beginning of year 3.2 6.1  
Actual return on plan assets (0.7) 0.2  
Employer contributions 1.2 1.9  
Participant contributions 0.0 0.0  
Gross benefits paid (1.5) (5.6)  
Currency translation effect (0.1) 0.6  
Fair value of plan assets at end of year 2.1 3.2 $ 6.1
Funded status at end of year $ (27.4) $ (27.3)