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SHARE-BASED PAYMENTS (Tables)
 12 Months Ended
Mar. 31, 2025
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:
 20252024
Equity-settled plans
Stock option plan$5.9 $7.0 
RSU plan6.6 4.7 
PSU plan12.7 3.6 
Cash-settled plans
Stock purchase plan16.2 15.7 
DSU plans14.9 (1.1)
RSU plan1.9 2.2 
PSU plan3.3 2.4 
Total share-based payments expense$61.5 $34.5 
Impact of equity swap agreements (Note 32)
(14.6)6.6 
Amount capitalized(1.0)(1.0)
Share-based payments expense, net of equity swap (Note 27)
$45.9 $40.1 
Carrying amount of share-based payments liabilities are as follows:

 20252024
Cash-settled plans
DSU plans$48.7 $41.6 
RSU plan6.5 9.1 
PSU plan10.4 10.5 
Total carrying amount of share-based payments liabilities$65.6 $61.2 
Current portion 25.3 9.9 
Non-current portion (Note 23)
$40.3 $51.3 
Disclosure of number and weighted average exercise prices of share options
Changes in outstanding stock options are as follows:
  2025   2024
  Weighted  Weighted
 Number ofaverage exerciseNumber ofaverage exercise
stock optionspricestock optionsprice
Stock options outstanding, beginning of year6,459,922 $27.19  6,323,537 $26.63 
Granted779,288 25.45  735,274 28.66 
Exercised(2,763,675)24.29  (405,943)19.34 
Forfeited(491,387)29.96  (192,946)31.04 
Stock options outstanding, end of year3,984,148 $28.52  6,459,922 $27.19 
Stock options exercisable, end of year2,525,692 $28.44  4,533,751 $26.57 
Disclosure of range of exercise prices of outstanding share options
As at March 31, 2025, 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
$20.57 to $26.78
1,663,993 3.79$22.52 995,113 $20.57 
$26.83 to $30.13
698,777 4.0928.33 272,161 27.80 
$33.47 to $38.01
1,621,378 2.5734.76 1,258,418 34.79 
Total3,984,148 3.34$28.52 2,525,692 $28.44 
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:
 2025 2024 
Common share price
$25.45 $27.85 
Exercise price
$25.45 $28.66 
Dividend yield
0.58 %0.72 %
Expected volatility
39.32 %41.88 %
Risk-free interest rate
3.53 %3.73 %
Expected stock option life
5 years4.5 years
Disclosure of number and weighted average exercise prices of other equity instruments
Changes in outstanding equity-settled RSUs are as follows:
20252024
Equity-settled RSUs outstanding, beginning of year292,634 — 
Granted393,805 304,142 
Cancelled(94,872)(11,104)
Settled in shares(15,370)— 
Settled in cash(1,471)(404)
Equity-settled RSUs outstanding, end of year574,726 292,634 
Equity-settled RSUs vested, end of year404,144 168,681 
Changes in outstanding equity-settled PSUs are as follows:
20252024
Equity-settled PSUs outstanding, beginning of year780,786 — 
Granted903,341 812,603 
Cancelled(242,151)(30,604)
Settled in shares(30,060)— 
Settled in cash(2,444)(1,213)
Equity-settled PSUs outstanding, end of year1,409,472 780,786 
Equity-settled PSUs vested, end of year1,037,878 489,134 
Changes in outstanding DSUs are as follows:
20252024
DSUs outstanding, beginning of year1,487,414 1,586,384 
Granted139,677 118,667 
Redeemed(249,780)(217,637)
DSUs vested and outstanding, end of year1,377,311 1,487,414 
Changes in outstanding cash-settled RSUs are as follows:
20252024
Cash-settled RSUs outstanding, beginning of year404,037 646,231 
Cancelled(43,833)(12,369)
Redeemed(167,065)(229,825)
Cash-settled RSUs outstanding, end of year193,139 404,037 
Cash-settled RSUs vested, end of year184,725 332,420 
Changes in outstanding cash-settled PSUs are as follows:
20252024
Cash-settled PSUs outstanding, beginning of year912,281 1,148,302 
Cancelled(283,840)(83,204)
Redeemed(136,545)(152,817)
Cash-settled PSUs outstanding, end of year491,896 912,281 
Cash-settled PSUs vested, end of year467,991 711,745