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Income Taxes (Details)
$ in Millions, ₩ in Billions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
KRW (₩)
Income Taxes [Line Items]              
Income tax provision $ 20.0   $ 12.4 $ 34.0 $ 19.7    
Effective income tax rate 34.70%   29.70% 31.20% 24.60%    
Adjustment for discrete tax expense, change in legislation in several states $ 3.0            
Adjustment for discrete tax expense, change in legislation and other discrete tax items $ 0.8            
Adjustment for income tax benefit, adjustment for stock-based compensation and change in valuation allowance     $ 3.9        
Adjustment for income tax benefit, amounts that should have been recognized in a prior period       $ 3.2      
Adjustment for income tax benefit, amounts that should have been recognized in a prior period and other discrete tax items       $ 2.0      
Adjustment for income tax benefit, adjustment pursuant to SAB-118, uncertain tax positions, adjustments for ASU 2016-09, and changes in valuation allowance         $ 8.8    
Tax Authority, South Korea (SRTO)              
Income Taxes [Line Items]              
Income tax assessment notice, amount           $ 9.8 ₩ 11.3
Pro forma              
Income Taxes [Line Items]              
Effective income tax rate 33.30%   39.20% 33.10% 35.60%    
Adjustment for income tax benefit, amounts that should have been recognized in a prior period   $ (3.2)