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Income Taxes - Income Tax Contingencies (Details)
$ in Millions, ₩ in Billions
 3 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
KRW (₩)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Income Tax Disclosure [Abstract]          
Increase (decrease) in additional liabilities related to unrecognized tax liabilities     $ (1.8) $ 3.4  
Increase (decrease) in assets related to unrecognized tax assets     4.3 19.8  
Increase (decrease) in unrecognized tax liabilities related to a foreign currency translation expense     0.9 (1.4)  
Unrecognized tax liabilities     70.2 72.6  
Unrecognized tax assets     29.7 25.4  
Reconciliation of total amounts of unrecognized income tax benefits          
Gross Unrecognized Tax Liabilities – opening balance     58.8 62.2 $ 47.8
Gross increases – tax positions in prior period     3.6 10.9 19.7
Gross decreases – tax positions in prior period     (10.6) 0.0 (15.4)
Gross increases – tax positions in current period     11.5 10.7 12.9
Gross decreases – tax positions in current period     0.0 0.0 0.0
Settlements     (1.5) (23.0) 0.0
Lapse of statute of limitations     (4.8) (2.1) (2.8)
Gross Unrecognized Tax Liabilities – ending balance     57.0 58.8 62.2
Expected reduction in income tax expense if uncertain tax positions are settled by the taxing authorities in the entity's favor     $ 27.4    
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)     14.80%    
Interest and penalties expense          
Interest related to unrecognized tax benefits, recorded as income (expense)     $ (1.2) (3.4) 0.7
Penalties related to unrecognized tax benefits, recorded as income tax income (expense)     1.9 (0.1) $ (2.3)
Accrued interest and penalties          
Accrued interest related to unrecognized tax benefits     8.5 7.3  
Accrued penalties related to unrecognized tax benefits     $ 4.6 $ 6.5  
South Koria (SRTO)          
Income Tax Contingency [Line Items]          
Pre-assessment notice, amount $ 10.2 ₩ 11.3