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Earnings Per Share (Antidilutive Securities) (Details) - shares
shares in Millions
3 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Outstanding Stock Awards    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share (in shares) 1.0 0.8