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INCOME TAXES - Narrative (Details) - CAD ($) $ in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Tax [Abstract]
Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised	$ 2,544.3	$ 2,294.4
Deductible temporary differences for which no deferred tax asset is recognised	$ 149.9	$ 125.4
Deductible temporary differences for which no deferred tax asset is recognised, period	25 years

X

- Definition

Deductible Temporary Differences For Which No Deferred Tax Asset Is Recognised, Period

+ References

No definition available.

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- Definition

Income Tax [Abstract]

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X

- 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]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2018-01-01
-Paragraph 81
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_e&doctype=Standard
-URIDate 2018-03-16

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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

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