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Earnings Per Share Antidilutive Securities (Details) (Outstanding Stock Awards)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Outstanding Stock Awards
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share, shares 0.3 0.2 0.3 0.2