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Pensions - Additional Information (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Pension settlement charges $ 6,100,000 $ 0 $ 6,100,000 $ 0
Number Of Individuals Elected Lump Sum Settlement     516  
Cost of defined contribution pension plans   7,200,000 $ 6,900,000 6,900,000
U.S. Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Pension settlement charges   $ 0 $ 6,100,000 $ 0
Weighted-average target return of pension plans   7.00% 7.10% 7.50%
Non-U.S. Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Pension settlement charges   $ 0 $ 0 $ 0
Weighted-average target return of pension plans   4.20% 4.20% 4.90%
Expected amortization of actuarial loss in next fiscal year   $ 3,300,000    
Expected amortization of prior service cost in next fiscal year   100,000    
Expected contribution to defined benefit plan   $ 1,300,000    
Maximum | Equity Securities | U.S. Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, plan assets, target allocation, percentage   73.00%    
Maximum | Equity Securities | Non-U.S. Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, plan assets, target allocation, percentage   75.00%    
Maximum | Fixed Income Securities | U.S. Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, plan assets, target allocation, percentage   45.00%    
Maximum | Cash and Cash Equivalents | U.S. Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, plan assets, target allocation, percentage   20.00%    
Maximum | Debt Securities | Non-U.S. Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, plan assets, target allocation, percentage   35.00%    
Minimum | U.S. Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Weighted-average target return of pension plans   7.00%    
Minimum | Equity Securities | U.S. Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, plan assets, target allocation, percentage   53.00%    
Minimum | Equity Securities | Non-U.S. Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, plan assets, target allocation, percentage   65.00%    
Minimum | Fixed Income Securities | U.S. Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, plan assets, target allocation, percentage   25.00%    
Minimum | Cash and Cash Equivalents | U.S. Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, plan assets, target allocation, percentage   0.00%    
Minimum | Debt Securities | Non-U.S. Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, plan assets, target allocation, percentage   25.00%