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Income Taxes - Income Tax Contingencies (Details)
$ in Millions, ₩ in Billions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
KRW (₩)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Income Tax Disclosure [Abstract]          
Increase (decrease) in additional liabilities related to unrecognized tax liabilities     $ 11.2 $ 22.4  
Increase (decrease) in assets related to unrecognized tax assets     (0.1) (0.4)  
Decrease in Unrecognized Tax Liabilities related to a foreign currency translation expense     0.1 0.7  
Unrecognized tax liabilities $ 68.6   68.6 56.1  
Unrecognized tax assets 1.6   1.6 1.9  
Reconciliation of total amounts of unrecognized income tax benefits          
Unrecognized Tax Liabilities – opening balance     46.7 24.3 $ 26.5
Gross increases – tax positions in prior period     18.0 9.2 0.0
Gross decreases – tax positions in prior period     (15.4) (4.8) (2.8)
Gross increases – tax positions in current period     11.3 20.9 6.6
Gross decreases – tax positions in current period     0.0 0.0 0.0
Settlements     0.0 0.0 (3.6)
Lapse of statute of limitations     (2.8) (2.9) (2.4)
Unrecognized Tax Liabilities – ending balance 57.8   57.8 46.7 24.3
Expected reduction in income tax expense if uncertain tax positions are settled by the taxing authorities in the entity's favor 56.6   $ 56.6    
Expected reduction in effective income tax rate if uncertain tax positions are settled by the taxing authorities in the entity's favor (as a percent)     39.80%    
Interest and penalties expense          
Interest related to unrecognized tax benefits, recorded as income (expense)     $ (0.7) 0.9 0.6
Penalties related to unrecognized tax benefits, recorded as income tax (income) expense     (2.3) (0.3) $ (0.3)
Accrued interest and penalties          
Accrued interest related to unrecognized tax benefits 4.3   4.3 5.2  
Accrued penalties related to unrecognized tax benefits 6.5   $ 6.5 $ 4.2  
SRTO          
Income Tax Contingency [Line Items]          
Pre-assessment notice, amount $ 8.0 ₩ 9.2