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SHARE CAPITAL, EARNINGS PER SHARE AND DIVIDENDS (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Feb. 09, 2018
Earnings per share [line items]      
Number of shares authorized to be repurchased renewal, shares     5,349,804
Stock repurchased and retired during period, shares 2,081,200 2,490,900  
Stock repurchased and retired during period, per shares $ 21.53 $ 16.73  
Repurchase of common shares $ 44.8 $ 41.7  
Number of shares issued and fully paid, shares 267,738,530 268,397,224  
Antidilutive securities excluded from computation of earnings per share, shares 1,941,200 46,700  
Dividends $ 93.9 $ 84.6  
Dividends (in CAD per share) $ 0.35 $ 0.315  
Private Share Repurchase Agreement      
Earnings per share [line items]      
Stock repurchased and retired during period, shares 600,000    
Retained earnings      
Earnings per share [line items]      
Repurchase of common shares $ (39.9) $ (36.1)