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Postretirement and Other Benefits - Amounts Recognized in Accumulated Other Comprehensive Income (Details)
$ in Millions
Dec. 31, 2018
USD ($)
United States | Pension Benefits  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Accumulated loss $ 29.1
Prior service credit 0.0
Accumulated other comprehensive loss 29.1
United States | OPEB Benefits  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Accumulated loss 0.1
Prior service credit (0.1)
Accumulated other comprehensive loss 0.0
France | Pension Benefits  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Accumulated loss 13.5
Prior service credit (3.0)
Accumulated other comprehensive loss $ 10.5