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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)

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