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Income Taxes - Income Tax Contingencies (Details)
$ in Millions, ₩ in Billions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
KRW (₩)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Income Tax Disclosure [Abstract]          
Increase (decrease) in additional liabilities related to unrecognized tax liabilities     $ (3.4) $ 14.4  
Increase (decrease) in assets related to unrecognized tax assets     19.8 3.2  
Increase (decrease) in unrecognized tax liabilities related to a foreign currency translation expense     1.4 (0.1)  
Unrecognized tax liabilities $ 62.2   72.6 62.2  
Unrecognized tax assets 5.6   25.4 5.6  
Reconciliation of total amounts of unrecognized income tax benefits          
Gross Unrecognized Tax Liabilities – opening balance     62.2 47.8 $ 24.3
Gross increases – tax positions in prior period     10.9 19.7 9.2
Gross decreases – tax positions in prior period     0.0 (15.4) (4.8)
Gross increases – tax positions in current period     10.7 12.9 22.0
Gross decreases – tax positions in current period     0.0 0.0 0.0
Settlements     (23.0) 0.0 0.0
Lapse of statute of limitations     (2.1) (2.8) (2.9)
Gross Unrecognized Tax Liabilities – ending balance 62.2   58.8 62.2 47.8
Expected reduction in income tax expense if uncertain tax positions are settled by the taxing authorities in the entity's favor     $ 33.4    
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)     158.20%    
Interest and penalties expense          
Interest related to unrecognized tax benefits, recorded as income (expense)     $ (3.4) 0.7 (0.9)
Penalties related to unrecognized tax benefits, recorded as income tax income (expense)     (0.1) (2.3) $ 0.3
Accrued interest and penalties          
Accrued interest related to unrecognized tax benefits 4.3   7.3 4.3  
Accrued penalties related to unrecognized tax benefits 6.5   $ 6.5 $ 6.5  
SRTO          
Income Tax Contingency [Line Items]          
Pre-assessment notice, amount $ 9.7 ₩ 10.4