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Income Taxes (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Income Taxes [Abstract]    
Unrecognized tax benefits $ 0.3  
Recognition of tax benefits 0.3 $ 0.3
Amount of interest and penalties   0.1
Cash payments for income taxes $ 16.2 $ 18.2