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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Unrecognized tax benefits $ 21.1 $ 21.1 $ 9.7
Unrecognized tax benefits that would impact effective tax rate 16.0 16.0 9.7
Unrecognized tax benefits, potential interest expense and penalties 1.5 1.5 $ 0.2
Federal tax benefit $ 0.1 2.4  
Deferred state tax benefit   $ 4.3