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Earnings Per Common Share - Narrative (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]        
Potentially dilutive securities excluded from computations of diluted net earnings per common share (in shares) 3 2 2 2