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INCOME TAXES - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Canadian statutory income tax rates | 26.72% | 26.85%
Tax cuts and jobs act, change in tax rate | $ 33.1 |
Current period | 69.9 | $ 53.8
Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised | 2,294.4 | 2,099.1
Deductible temporary differences for which no deferred tax asset is recognised | $ 125.4 | 243.5
Deductible temporary differences for which no deferred tax asset is recognised, period | 30 years |
Accumulated capital losses for which no deferred tax asset is recognised | $ 0.8 | 0.9
Accumulated other comprehensive income |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax expense (income) | (1.1) | 11.6
Current period | $ 0.0 | $ 0.6

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- Definition Deductible Temporary Differences For Which No Deferred Tax Asset Is Recognised, Period + References No definition available. + Details
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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 80 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_80_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_ii&doctype=Standard -URIDate 2018-03-16 + Details
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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: Associates [member]; Subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_f&doctype=Standard -URIDate 2018-03-16 + Details
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