SHARE-BASED PAYMENTS - Share-based Compensation Cost (Details) - CAD ($) $ in Millions	12 Months Ended
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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Current portion of carrying amount of share-based payment liabilities

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Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount1

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Hedging Expense (Recovery), Recognized

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Share based payments expense, net of equity swap

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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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

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- Definition

The amount of expense arising from equity-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]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions]

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The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]]

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