SUMMARY OF MATERIAL ACCOUNTING POLICIES - Tax credits, government assistance and deferred subsidies (Details) - CAD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
SUMMARY OF MATERIAL ACCOUNTING POLICIES
Deferred subsidies	$ 35.2	$ 34.2	$ 0.0

The amount of current government grants recognised in the statement of financial position as deferred income. [Refer: Government [member]; Government grants]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard
-URIDate 2025-03-27

Name:	ifrs-full_CurrentGovernmentGrants
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant