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OTHER (GAINS) AND LOSSES - Narrative (Details) - CAD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Analysis of income and expense [abstract]
Impairment of technology and other non-financial assets (Note 5)	$ 35.7	$ 0.0	$ 35.7
Impairment of intangible assets	31.4
Impairment of property, plant and equipment	$ 4.3

X

- Definition

Impairment Loss Recognised in Profit or Loss, Intangibles and Property Plant and Equipment.

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- Definition

The amount of impairment loss recognised in profit or loss for intangible assets other than goodwill. [Refer: Impairment loss recognised in profit or loss; Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2024-01-01
-Paragraph 118
-Subparagraph e
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- Definition

The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2024-01-01
-Paragraph 73
-Subparagraph e
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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