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Postretirement and Other Benefits - Amortization of 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]  
Amortization of accumulated loss $ (3.5)
Amortization of prior service credit 0.0
Total (3.5)
UNITED STATES | Other Postretirement Benefits Plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Amortization of accumulated loss (0.3)
Amortization of prior service credit 0.1
Total (0.2)
FRANCE | Pension Plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Amortization of accumulated loss (1.1)
Amortization of prior service credit 0.3
Total $ (0.8)