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SHARE-BASED PAYMENTS (Tables)
 12 Months Ended
Mar. 31, 2023
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:
 20232022
Equity-settled plan
Stock option plan$6.1 $7.8 
Cash-settled plans
Stock purchase plan12.8 11.6 
Deferred share unit (DSU) plans3.3 1.1 
Restricted share unit (RSU) plans5.9 1.3 
Performance share unit (PSU) plan0.4 9.2 
Total share-based payments expense$28.5 $31.0 
Impact of equity swap agreements (Note 29)
5.3 9.2 
Amount capitalized(0.9)(0.5)
Share-based payments expense, net of equity swap (Note 24)
$32.9 $39.7 
Carrying amount of share-based payments liabilities are as follows:

 20232022
Cash-settled plans
Deferred share unit (DSU) plans$21.3 $20.6 
Restricted share unit (RSU) plans40.5 42.4 
Performance share unit (PSU) plan12.7 26.8 
Total carrying amount of share-based payments liabilities$74.5 $89.8 
Current portion 11.3 19.8 
Non-current portion (Note 20)
$63.2 $70.0 
Disclosure of number and weighted average exercise prices of share options
Changes in outstanding stock options are as follows:
  2023   2022
  Weighted  Weighted
 Number ofaverage exerciseNumber ofaverage exercise
stock optionspricestock optionsprice
Stock options outstanding, beginning of year6,783,444 $25.08  7,476,902 $23.39 
Granted624,700 32.92  712,477 36.79 
Exercised(882,167)18.49  (1,268,660)21.37 
Forfeited(202,440)29.28  (134,275)28.57 
Expired— —  (3,000)14.66 
Stock options outstanding, end of year6,323,537 $26.63  6,783,444 $25.08 
Stock options exercisable, end of year3,877,399 $25.62  3,395,732 $23.35 
Disclosure of range of exercise prices of outstanding share options
As at March 31, 2023, 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
$16.15 to $20.86
2,168,433 3.83$20.22 1,073,383 $19.87 
$21.61 to $27.14
1,978,304 1.7924.80 1,952,804 24.83 
$28.95 to $38.01
2,176,800 4.5734.69 851,212 34.66 
Total6,323,537 3.44$26.63 3,877,399 $25.62 
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:
 2023 2022 
Common share price
$30.87 $37.24 
Exercise price
$32.92 $36.79 
Dividend yield
0.65 %0.64 %
Expected volatility
42.12 %40.51 %
Risk-free interest rate
3.30 %0.76 %
Expected stock option life
4.5 years4.0 years
Disclosure of number and weighted average exercise prices of other equity instruments
Changes in outstanding DSUs are as follows:
20232022
DSUs outstanding, beginning of year634,342 550,742 
Granted143,206 86,876 
Redeemed(79,568)(3,276)
DSUs vested and outstanding, end of year697,980 634,342 
Changes in outstanding RSUs are as follows:
20232022
RSUs outstanding, beginning of year1,529,704 1,430,524 
Granted285,279 289,745 
Cancelled(31,505)(13,690)
Redeemed(248,843)(176,875)
RSUs outstanding, end of year1,534,635 1,529,704 
RSUs vested, end of year1,289,049 1,303,042 
Changes in outstanding PSUs are as follows:
20232022
PSUs outstanding, beginning of year847,171 820,090 
Granted817,218 571,459 
Cancelled(48,601)(23,135)
Redeemed(467,486)(521,243)
PSUs outstanding, end of year1,148,302 847,171 
PSUs vested, end of year687,120 570,457