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Income Taxes (Details)
$ in Millions, ₩ in Billions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
KRW (₩)
Income Taxes [Line Items]            
Income tax provision $ 21.5 $ 23.0 $ 55.5 $ 42.7    
Effective income tax rate 30.30% 37.30% 30.90% 30.10%    
Discrete tax benefit, closing US tax audit and return to provision adjustments, and recording of a valuation allowance $ 1.3          
Adjustment for income tax expense, change in valuation allowance in the U.S.   $ 1.5        
Adjustment for income tax benefit, amounts that should have been recognized in a prior period, closure of US tax audit and recording of a valuation allowance     $ 3.3      
Adjustment for income tax benefit, adjustment pursuant to the Tax Reform Act, changes in valuation allowance and adjustment for stock-based compensation       $ 7.4    
Tax Authority, South Korea (SRTO)            
Income Taxes [Line Items]            
Income tax assessment notice, amount         $ 9.4 ₩ 11.3
Pro forma            
Income Taxes [Line Items]            
Effective income tax rate 32.20% 34.90% 32.70% 35.30%