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SHARE-BASED PAYMENTS - Share-based Compensation Cost (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Recognized in the consolidated statement of financial position | $ 99.1 | $ (0.1)
Hedging expense (recovery), recognized | (45.6) | 44.0
Allocation of recognized period costs, capitalized amount | (0.5) | (1.2)
Share based payments expense, net of equity swap | 53.0 | 42.7
Total carrying amount of share-based payments liabilities | 102.8 | 49.3
Current portion of carrying amount of share-based payment liabilities | 23.1 | 14.2
Share-based payments liabilities (Note 26) | 79.7 | 35.1
Employee Stock Option Plan |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Expense from equity-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets | 9.8 | 5.8
Employee Stock Purchase Plan (ESPP) |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Expense from cash-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets | 10.0 | 10.3
Deferred Share Unit (DSU) |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Expense from cash-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets | 11.4 | (2.4)
Share-based compensation obligations | 19.7 | 8.4
Restricted Share Unit Plan (RSU) |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Expense from cash-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets | 28.6 | (10.9)
Share-based compensation obligations | 46.3 | 24.7
Performance Share Unit Plan (PSU) |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Expense from cash-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets | 39.3 | (2.9)
Share-based compensation obligations | $ 36.8 | $ 16.2

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