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SHARE CAPITAL, EARNINGS PER SHARE AND DIVIDENDS - Narrative (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 12, 2021
CAD ($)
$ / shares
shares
Nov. 30, 2020
CAD ($)
$ / shares
shares
Mar. 12, 2021
CAD ($)
$ / shares
Mar. 31, 2021
CAD ($)
shares
Mar. 31, 2020
CAD ($)
$ / shares
shares
Mar. 12, 2021
$ / shares
Feb. 07, 2020
shares
Share Capital, Reserves And Other Equity Interest [Abstract]              
Number of shares issued and fully paid, shares | shares       293,355,463 265,619,627    
Issue of equity, number of shares issued | shares 10,454,545 16,594,126          
Equity Issued, Price Per Share | (per share) $ 34.29 $ 29.85 $ 34.29     $ 27.50  
Proceeds from issue of ordinary shares | $ $ 358.5 $ 495.3          
Share issue related cost | $     $ 42.3        
Share issue related cost, income tax recovery | $     $ 11.2        
Number of shares authorized to be repurchased renewal, shares | shares             5,321,474
Stock repurchased and retired during period, shares | shares       0 1,493,331    
Stock repurchased and retired during period, per shares | $ / shares         $ 33.22    
Repurchase of common shares | $         $ 49.6    
Antidilutive securities excluded from computation of earnings per share, shares | shares       7,476,902 1,293,200    
Dividends | $       $ 0.0 $ 114.3    
Dividends (in CAD per share) | $ / shares         $ 0.43