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Financial instruments and related risk management (Aging of trade receivables) (Details) - CAD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Trade receivables $ 309,570 $ 413,792
Corporate customers [Member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 305,242  
Other Customers [Member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 4,328  
Current [Member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 308,720  
Current [Member] | Corporate customers [Member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 304,684  
Current [Member] | Other Customers [Member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 4,036  
1-30 Days Past Due [Member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 227  
1-30 Days Past Due [Member] | Corporate customers [Member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 0  
1-30 Days Past Due [Member] | Other Customers [Member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 227  
More Than 30 Days Past Due [Member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 623  
More Than 30 Days Past Due [Member] | Corporate customers [Member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 558  
More Than 30 Days Past Due [Member] | Other Customers [Member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables $ 65