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INCOME TAXES - Reconciliation of Income Taxes (Details) - CAD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Income Tax [Abstract] |  |
(Loss) earnings before income taxes | $ (87.2) | $ 392.7
Canadian statutory income tax rates | 26.53% | 26.64%
Income taxes at Canadian statutory rates | $ (23.1) | $ 104.6
Effect of differences in tax rates in other jurisdictions | (5.8) | (19.9)
Unrecognized tax benefits and tax benefits not previously recognized | 3.2 | 3.4
Non-taxable revenues | (4.8) | (6.2)
Tax impact on after-tax profit of equity accounted investees | (1.1) | (6.1)
Prior years' tax adjustments | (6.3) | (4.9)
Other | (1.8) | 2.9
Income tax (recovery) expense | $ (39.7) | $ 73.8

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- Definition The amount of profit (loss) for a period before deducting tax expense. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2020-01-01 + Details
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