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Income Taxes - Unrecognized Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Contingency [Line Items]      
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 0.4    
Reconciliation of Unrecognized Tax Benefits [Roll Forward]      
Uncertain tax position balance at beginning of year 0.9 $ 1.8 $ 1.8
Increases related to current year tax positions 2.0 0.0 0.0
Decrease related to expiration of statute of limitations (0.5) (0.9) 0.0
Uncertain tax position balance at end of year 2.4 $ 0.9 $ 1.8
Decrease in unrecognized tax benefits that may be recognized in next fiscal year $ 2.1