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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Tax cuts and jobs act of 2017, provisional income tax benefit $ 10.0    
Tax cuts and jobs act of 2017, provisional benefit, change in tax rate 16.0    
Tax cuts and jobs act of 2017, provisional income tax expense, transition tax for accumulated foreign earnings 7.0    
Accumulated foreign earnings 101.0 $ 101.0  
Tax cuts and jobs act of 2017, provision income tax benefit, current year cash dividends 1.0    
Current and prior year undistributed earnings of subsidiaries operating outside the U.S 151.0 151.0  
Deferred tax assets, investment in joint venture 5.3 5.3 $ 0.0
Valuation allowance increase   0.8  
Credit carryforwards 3.0 3.0  
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 12.0 12.0  
Amount that would affect effective tax rate 3.0 3.0 $ 2.0
Accrued interest and penalties on unrecognized tax benefits 1.0 1.0  
Expiring tax credit carryforwards      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards $ 7.0 $ 7.0