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Postretirement and Other Benefits - Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
United States, Pension Benefits [Member]      
Change in Projected Benefit Obligation, or PBO:      
PBO at beginning of year $ 123.4 $ 132.4  
Service cost 0.0 0.0 $ 0.0
Interest cost 5.2 5.0 5.6
Actuarial (gain) loss 2.4 (6.5)  
Participant contributions 0.0 0.0  
Plan amendment 0.0 0.0  
Gross benefits paid (7.8) (7.5)  
Currency translation effect 0.0 0.0  
PBO at end of year 123.2 123.4 132.4
Change in Plan Assets:      
Fair value of plan assets at beginning of year 116.7 128.9  
Actual return on plan assets 10.0 (4.7)  
Employer contributions 0.0 0.0  
Participant contributions 0.0 0.0  
Plan amendment 0.0 0.0  
Gross benefits paid (7.8) (7.5)  
Currency translation effect 0.0 0.0  
Fair value of plan assets at end of year 118.9 116.7 128.9
Funded status at end of year (4.3) (6.7)  
France, Pension Benefits [Member]      
Change in Projected Benefit Obligation, or PBO:      
PBO at beginning of year 32.2 37.3  
Service cost 1.0 1.3 1.3
Interest cost 0.4 0.4 0.8
Actuarial (gain) loss 2.1 (0.6)  
Participant contributions 0.0 0.0  
Plan amendment 0.0 (0.7)  
Gross benefits paid (3.0) (2.5)  
Currency translation effect (0.3) (3.0)  
PBO at end of year 32.4 32.2 37.3
Change in Plan Assets:      
Fair value of plan assets at beginning of year 8.4 10.2  
Actual return on plan assets 0.1 0.5  
Employer contributions 0.7 1.3  
Participant contributions 0.0 0.0  
Plan amendment 0.0 0.0  
Gross benefits paid (2.9) (2.6)  
Currency translation effect (0.2) (1.0)  
Fair value of plan assets at end of year 6.1 8.4 10.2
Funded status at end of year (26.3) (23.8)  
United States, OPEB [Member]      
Change in Projected Benefit Obligation, or PBO:      
PBO at beginning of year 1.7 1.8  
Service cost 0.0 0.0 0.0
Interest cost 0.1 0.1 0.1
Actuarial (gain) loss 0.0 0.4  
Participant contributions 0.1 0.1  
Plan amendment 0.0 0.0  
Gross benefits paid (0.5) (0.7)  
Currency translation effect 0.0 0.0  
PBO at end of year 1.4 1.7 1.8
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 0.4 0.6  
Participant contributions 0.1 0.1  
Plan amendment 0.0 0.0  
Gross benefits paid (0.5) (0.7)  
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) $ (1.7)