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SHARE-BASED PAYMENTS - Share-based Compensation Cost (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Recognized in the consolidated statement of financial position | $ 60.7 | $ 55.3
Share-based compensation obligations | (130.5) | (115.3)
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 | 8.5 | 7.4
Share-based compensation obligations | 0.0 | 0.0
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 | 6.3 | 5.4
Share-based compensation obligations | (15.5) | (16.2)
Long-Term Incentive – Deferred Share Unit Plan (LTI-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 | 6.6 | 4.8
Share-based compensation obligations | (31.6) | (27.1)
Long-Term Incentive – Time Based Restricted Share Unit Plan (LTI-TB 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 | 6.4 | 5.2
Share-based compensation obligations | (11.6) | (10.0)
Long-Term Incentive – Performance Share Unit Plan (LTI-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 | 26.5 | 27.6
Share-based compensation obligations | (47.0) | (40.7)
Cash-Settled Share-Based Payment Arrangement |  |
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 | 54.3 | 50.4
Share-based compensation obligations | (105.7) | (94.0)
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 | 6.4 | 4.9
Share-based compensation obligations | (24.8) | (21.3)
Equity-Settled Share-Based Payment Arrangement |  |
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 | 6.4 | 4.9
Share-based compensation obligations | $ (24.8) | $ (21.3)

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition 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]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 51 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_51_b_i&doctype=Standard -URIDate 2018-03-16 + Details
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