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Income Taxes Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Liability for Uncertain Tax Positions, Noncurrent $ 0.4 $ 1.0 $ 1.3
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions $ (0.6) $ (0.3)