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Postretirement and Other Benefits - Net Pension Benefit Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
United States | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 0.0 $ 0.0 $ 0.0
Interest cost 4.3 4.8 5.2
Expected return on plan assets (5.8) (6.4) (6.8)
Amortizations and other 3.2 3.2 3.8
Net periodic benefit cost 1.7 1.6 2.2
United States | OPEB Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost 0.0 0.0 0.0
Interest cost 0.1 0.1 0.1
Expected return on plan assets 0.0 0.0 0.0
Amortizations and other 0.1 0.2 0.2
Net periodic benefit cost 0.2 0.3 0.3
France | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost 1.1 1.1 1.0
Interest cost 0.4 0.4 0.4
Expected return on plan assets (0.1) (0.2) (0.2)
Amortizations and other 1.1 1.4 1.1
Net periodic benefit cost $ 2.5 $ 2.7 $ 2.3