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Pension and Postretirement Benefits - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Assumed health care cost trend rate 7.50% 7.00%  
Decrease in assumed health care cost trend rate 4.50% 4.50%  
Effect of one percentage point increase on accumulated post retirement benefit obligation $ 1.4    
Effect of one percentage point increase in assumed health care cost trend rate on total service and interest cost components 0.1    
Effect of one percentage point decrease in assumed health care cost trend rate on accumulated post retirement benefit obligation 1.1    
Effect of one percentage point decrease in assumed health care cost trend rate on total service and interest cost components $ 0.1    
Maximum percentage of funding status of plans in red zone 65.00%    
Maximum percentage of funding status of plans in yellow zone 80.00%    
Maximum percentage of funding status of plans in green zone 80.00%    
401(k) plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of employer matching contribution with employee gross pay 100.00%    
Percentage of employer matching contribution match with 100 percent 3.00%    
Percentage of employer matching contribution 50.00%    
Percentage of employer matching contribution match with 50 percent 2.00%    
Expense associated with other employee benefit plans $ 4.2 $ 3.9 $ 3.7
Domestic Plans | Unfunded Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Estimated net actuarial loss for pension plans that is expected to be amortized 0.1    
Domestic Plans | Funded Plans      
Defined Benefit Plan Disclosure [Line Items]      
Estimated net actuarial loss for pension plans that is expected to be amortized 0.4    
Foreign Pension Plans | Funded Plans      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial losses for the foreign funded plans recognized in AOCI (before tax) (2.5) (3.3)  
Net actuarial losses for the foreign funded plans recognized in AOCI (after tax) (1.8) (2.5)  
Foreign Pension Plans | Unfunded Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial losses for the foreign unfunded plans recognized in AOCI (before tax) (0.7) (0.4)  
Net actuarial losses for the foreign unfunded plans recognized in AOCI (after tax) (0.5) $ (0.3)  
Postretirement Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Amount expected to contribute in postretirement benefit plans 1.1    
Postretirement Benefit Plans | Domestic Plans      
Defined Benefit Plan Disclosure [Line Items]      
Estimated net actuarial loss for pension plans that is expected to be amortized 0.2    
Estimated prior service credit for postretirement benefit plans 0.2    
Pension Plans | Unfunded Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Amount expected to contribute in unfunded pension plans 1.0    
Pension Plans | Funded Plans      
Defined Benefit Plan Disclosure [Line Items]      
Amount expected to contribute in funded pension plans $ 1.1