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Postretirement and Other Benefits - Amounts Recognized in Accumulated Other Comprehensive Income (Details)
$ in Millions
Dec. 31, 2017
USD ($)
UNITED STATES | Pension Plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Accumulated loss $ 27.1
Prior service credit 0.0
Accumulated other comprehensive loss 27.1
UNITED STATES | Other Postretirement Benefits Plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Accumulated loss 0.6
Prior service credit (0.2)
Accumulated other comprehensive loss 0.4
FRANCE | Pension Plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Accumulated loss 12.5
Prior service credit (3.4)
Accumulated other comprehensive loss $ 9.1