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Financial instruments (Derivatives) (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]    
Net $ (55,535) $ 27,101
Gain (loss) (72,949) 12,529
Current portion of other liabilities [member]    
Disclosure of detailed information about financial instruments [line items]    
Net (25,913) (378)
Other liabilities [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net (32,429) (4,619)
Current portion of long-term receivables, investments and other [member]    
Disclosure of detailed information about financial instruments [line items]    
Net 1,331 22,652
Long-term receivables, investments and other [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net 1,476 9,446
Foreign currency contracts [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net (48,251) 27,774
Gain (loss) (66,360) 13,202
Interest rate contracts [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net (7,284) (673)
Gain (loss) $ (6,589) $ (673)