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Financial instruments and related risk management (Derivatives) (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Net $ (143,506) $ 6,123
Gain (loss) (183,103) 37,791
Current portion of other liabilities [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net (83,890) (14,338)
Other liabilities [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net (59,719) (8,006)
Current portion of long-term receivables, investments and other [member]    
Disclosure of detailed information about financial instruments [line items]    
Net 68 9,137
Long-term receivables, investments and other [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net 35 19,330
Foreign currency contracts [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net (140,334) 11,942
Gain (loss) (182,988) 38,975
Interest rate contracts [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net (3,172) (5,819)
Gain (loss) $ (115) $ (1,184)