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SHARE-BASED PAYMENTS - Share-based Compensation Cost (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Total share-based payments expense | $ 31.0 | $ 99.1
Impact of equity swap agreements (Note 31) | 9.2 | (45.6)
Amount capitalized | (0.5) | (0.5)
Share-based payments expense, net of equity swap (Note 25) | 39.7 | 53.0
Total carrying amount of share-based payments liabilities | 89.8 | 102.8
Current portion | 19.8 | 23.1
Non-current portion (Note 21) | 70.0 | 79.7
Stock option plan |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Equity-settled plan | 7.8 | 9.8
Stock purchase plan |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Cash-settled plans | 11.6 | 10.0
Deferred share unit (DSU) plans |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Cash-settled plans | 1.1 | 11.4
Cash-settled plans | 20.6 | 19.7
Restricted share unit (RSU) plans |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Cash-settled plans | 1.3 | 28.6
Cash-settled plans | 42.4 | 46.3
Performance share unit (PSU) plan |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Cash-settled plans | 9.2 | 39.3
Cash-settled plans | $ 26.8 | $ 36.8

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- Definition The amount of expense arising from cash-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets. [Refer: Expense from share-based payment transactions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
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