XML 298 R93.htm IDEA: XBRL DOCUMENT v3.20.1
SHARE CAPITAL, EARNINGS PER SHARE AND DIVIDENDS - Narrative (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Feb. 07, 2020
Earnings per share [line items]      
Number of shares issued and fully paid, shares 265,619,627 265,447,603  
Number of shares authorized to be repurchased renewal, shares     5,321,474
Stock repurchased and retired during period, shares 1,493,331 3,671,900  
Stock repurchased and retired during period, per shares $ 33.22 $ 25.70  
Repurchase of common shares $ 49.6 $ 94.4  
Premium on repurchase of common shares $ 45.8 $ 85.6  
Antidilutive securities excluded from computation of earnings per share, shares 1,293,200 1,722,800  
Dividends $ 114.3 $ 103.9  
Dividends (in CAD per share) $ 0.43 $ 0.39