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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income Taxes    
Unrecognized Tax Benefits, Beginning Balance $ 13.1  
Additions based on tax positions related to current year 3.4  
Additions for tax positions of prior years 3.0  
Decreases resulting from settlements with tax authorities 3.0  
Unrecognized Tax Benefits, Period Increase (Decrease), Total 3.4  
Unrecognized Tax Benefits, Ending Balance 16.5  
Gross accrued interest and penalties on unrecognized tax benefits 1.8 $ 0.7
Unrecognized income tax benefits that, if recognized, would affect the effective tax rates 17.0 13.2
Unrecognized income tax benefits that, if recognized, would affect the effective tax rates , interest and penalties $ 1.2 $ 0.5