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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Income Tax Disclosure [Abstract]      
Effective income tax rate (percent) 35.90% 37.90%  
Uncertain tax liability $ 3.7   $ 4.1