INCOME TAXES - Narrative (Details) - CAD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
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| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] | ||
| Net deferred tax assets | $ 69.7 | $ 148.7 |
| Deferred income tax liability | 3,549.9 | 3,456.4 |
| Deductible temporary differences | 98.9 | 130.4 |
| Unrecognized | 215.4 | |
| Current tax expense (income), related to pillar two income taxes | 2.5 | 2.6 |
| No expiry date | ||
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] | ||
| Unrecognized | 174.7 | |
| No expiry date | Capital losses | ||
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] | ||
| Unrecognized | $ 170.5 | $ 156.2 |
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- Definition The amount of current tax expense (income) related to Pillar Two income taxes. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The amount of deferred tax asset when: (a) the utilisation of the deferred tax asset is dependent on future taxable profits in excess of the profits arising from the reversal of existing taxable temporary differences; and (b) the entity has suffered a loss in either the current or preceding period in the tax jurisdiction to which the deferred tax asset relates. [Refer: Temporary differences [member]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition 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. No definition available.
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- Definition The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Total for all associates [member]; Total for all subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries reported in separate financial statements] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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