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SHARE-BASED PAYMENTS (Tables)
 12 Months Ended
Mar. 31, 2021
Share-based Payment Arrangements [Abstract]  
Explanation of effect of share-based payments on entity's profit or loss
Share-based payments expense are as follows:
 20212020
Equity-settled plan
Stock option plan$9.8 $5.8 
Cash-settled plans
Stock purchase plan10.0 10.3 
Deferred share unit (DSU) plans11.4 (2.4)
Restricted share unit (RSU) plans28.6 (10.9)
Performance share unit (PSU) plan39.3 (2.9)
Total share-based payments expense$99.1 $(0.1)
Impact of equity swap agreements (Note 33)
(45.6)44.0 
Amount capitalized(0.5)(1.2)
Share-based payments expense, net of equity swap (Note 27)
$53.0 $42.7 
Carrying amount of share-based payments liabilities are as follows:

 20212020
Cash-settled plans
Deferred share unit (DSU) plans$19.7 $8.4 
Restricted share unit (RSU) plans46.3 24.7 
Performance share unit (PSU) plan36.8 16.2 
Total carrying amount of share-based payments liabilities$102.8 $49.3 
Current portion 23.1 14.2 
Non-current portion (Note 23)
$79.7 $35.1 
Disclosure of number and weighted average exercise prices of share options
Changes in outstanding stock options are as follows:
  2021   2020
  Weighted  Weighted
 Number ofaverage exerciseNumber ofaverage exercise
stock optionspricestock optionsprice
Stock options outstanding, beginning of year6,050,854 $24.25  6,504,125 $20.41 
Granted2,697,713 20.65  1,320,700 34.50 
Exercised(687,165)17.94  (1,553,846)17.06 
Forfeited(579,700)26.28  (196,825)24.17 
Expired(4,800)11.02  (23,300)10.06 
Stock options outstanding, end of year7,476,902 $23.39  6,050,854 $24.25 
Stock options exercisable, end of year2,934,364 $21.66  2,187,379 $19.05 
Disclosure of range of exercise prices of outstanding share options
As at March 31, 2021, summarized information about the stock options issued and outstanding is as follows:
 Options OutstandingOptions Exercisable
Weighted 
Number ofaverage remainingWeighted Number ofWeighted
Range ofstock optionscontractual lifeaverage exercisestock optionsaverage exercise
exercise pricesoutstanding (years)price  exercisableprice
$14.61 to $16.15
1,201,885 1.80$15.80 1,201,885 $15.80 
$20.24 to $22.26
3,735,679 5.1321.12 864,229 22.13 
$22.31 to $34.98
2,539,338 4.6430.31 868,250 29.29 
Total7,476,902 4.43$23.39 2,934,364 $21.66 
Disclosure of indirect measurement of fair value of goods or services received, other equity instruments granted during period
The assumptions used in the calculation of the fair value of the stock options on the grant date using the Black-Scholes option pricing model are as follows:
 2021 2020 
Common share price
$21.48 $33.94 
Exercise price
$20.65 $34.50 
Dividend yield
2.01 %1.18 %
Expected volatility
35.22 %19.70 %
Risk-free interest rate
0.36 %1.48 %
Expected stock option life
4 years4 years
Disclosure of number and weighted average exercise prices of other equity instruments
Changes in outstanding DSUs are as follows:
20212020
DSUs outstanding, beginning of year469,835 523,470 
Granted81,980 79,196 
Redeemed(1,073)(140,251)
Dividends paid in DSUs— 7,420 
DSUs vested and outstanding, end of year550,742 469,835 
Changes in outstanding RSUs are as follows:
20212020
RSUs outstanding, beginning of year1,490,603 1,570,063 
Granted246,249 149,477 
Cancelled(42,264)(16,207)
Redeemed(264,064)(228,928)
Dividends paid in RSUs— 16,198 
RSUs outstanding, end of year1,430,524 1,490,603 
RSUs vested, end of year1,295,233 1,391,195 
Changes in outstanding PSUs are as follows:
20212020
PSUs outstanding, beginning of year976,873 1,141,200 
Granted585,162 730,352 
Cancelled(41,266)(41,991)
Redeemed(700,680)(852,688)
PSUs outstanding, end of year820,089 976,873 
PSUs vested, end of year649,449 758,209