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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Valuation Allowance [Line Items]      
Tax expense $ (1.5) $ (107.7)  
Federal income tax at statutory rate (as a percent) 35.00%    
Unrecognized tax benefits $ 15.7   $ 15.8
Spin Off Transaction      
Valuation Allowance [Line Items]      
Increase (decrease) in valuation allowance $ 106.5