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SHARE CAPITAL, EARNINGS PER SHARE AND DIVIDENDS (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings per share [line items]    
Stock repurchased and retired during period, shares 3,671,900 2,081,200
Stock repurchased and retired during period, per shares $ 25.70 $ 21.53
Repurchase of common shares $ 94.4 $ 44.8
Number of shares issued and fully paid, shares 265,447,603 267,738,530
Antidilutive securities excluded from computation of earnings per share, shares 1,722,800 1,941,200
Dividends $ 103.9 $ 93.9
Dividends (in CAD per share) $ 0.39 $ 0.35
Retained earnings    
Earnings per share [line items]    
Repurchase of common shares $ (85.6) $ (39.9)