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Income Taxes Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]        
Liability for Uncertain Tax Positions, Noncurrent $ 1.3 $ 1.0 $ 1.3 $ 2.3
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions $ (1.0) $ (0.3)