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FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT - Credit risk management (Details) - Credit risk management - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT    
Gross carrying amounts of financial assets represent the maximum credit exposure $ 1,054.2 $ 1,157.3
Provision for expected credit loss (as a percent) 4.10% 3.40%
90 days past due    
FINANCIAL INSTRUMENTS AND FINANCIAL RISK MANAGEMENT    
Trade receivables past due (as a percent) 2.80% 3.30%