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Income Taxes - Income Tax Contingencies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Taxes      
Increase (decrease) in additional liabilities related to unrecognized tax liabilities $ 22.4 $ 2.1  
Increase (decrease) in assets related to unrecognized tax assets (0.4) 4.5  
Decrease in Unrecognized Tax Liabilities related to a foreign currency translation expense (0.7) 0.5  
Unrecognized Tax Liabilities 56.1 33.0  
Unrecognized Tax Assets 1.9 2.3  
Reconciliation of total amounts of unrecognized income tax benefits      
Unrecognized Tax Liabilities - opening balance 24.3 26.5 $ 22.3
Gross increases - tax positions in prior period 9.2   2.6
Gross decreases - tax positions in prior period (4.8) (2.8)  
Gross increases - tax positions in current period 20.9 6.6 5.0
Settlements   (3.6)  
Lapse of statute of limitations (2.9) (2.4) (3.4)
Unrecognized Tax Liabilities - ending balance 46.7 24.3 26.5
Expected reduction in income tax expense if uncertain tax positions are settled by the taxing authorities in the entity's favor $ 45.3    
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) 20.70%    
Interest and penalties expense      
Interest related to unrecognized tax benefits, recorded as (income) expense $ 0.9 (0.6) (0.6)
Penalties related to unrecognized tax benefits, recorded as income tax (income) expense (0.3) (0.3) $ (0.3)
Accrued interest and penalties      
Accrued interest related to unrecognized tax benefits 5.2 4.2  
Accrued penalties related to unrecognized tax benefits $ 4.2 $ 4.5