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SHARE-BASED PAYMENTS - Share-based Compensation Cost (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Recognized in the consolidated statement of financial position | $ 55.3 | $ 51.2
Share-based compensation obligations | (115.3) | (96.6)
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 | 7.4 | 6.8
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 | 5.4 | 5.5
Share-based compensation obligations | (16.2) | (14.1)
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 | 4.8 | 7.2
Share-based compensation obligations | (27.1) | (23.9)
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 | 5.2 | 4.5
Share-based compensation obligations | (10.0) | (8.1)
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 | 27.6 | 23.5
Share-based compensation obligations | (40.7) | (31.1)
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 | 50.4 | 47.5
Share-based compensation obligations | (94.0) | (77.2)
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 | 4.9 | 3.7
Share-based compensation obligations | (21.3) | (19.4)
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 | 4.9 | 3.7
Share-based compensation obligations | $ (21.3) | $ (19.4)

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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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