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OTHER (GAINS) AND LOSSES (Details) - CAD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Analysis of income and expense [abstract]
Impairment of non-financial assets	$ 103.5	$ 0.0
Net gain on foreign currency exchange differences	(17.2)	(41.6)
Impairment of goodwill (Note 29)	0.0	(37.5)
Other	5.4	(12.7)
Other (gains) and losses	$ 91.7	$ (16.8)

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Impairment Loss On Non-Financial Assets, COVID-19

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Miscellaneous, Other Gains And (Losses)

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The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Financial instruments, class [member]]

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The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill]

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The gains (losses) that the entity does not separately disclose in the same statement or note.

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