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Postretirement and Other Benefits - PBO and ABO in Excess of Fair Value of Plan Assets (Details) - Pension Plan [Member] - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
UNITED STATES      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
PBO $ 124.1 $ 123.2  
ABO 124.1 123.2  
Fair value of plan assets 128.7 118.9 $ 116.7
FRANCE      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
PBO 30.5 32.4  
ABO 25.6 28.2  
Fair value of plan assets $ 3.2 $ 6.1 $ 8.4