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Financial instruments (Measurement of fair values hierarchy levels) (Details) - CAD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]    
Derivative assets $ 2,807 $ 32,098
Derivative liabilities (58,342) (4,997)
Long-term debt (997,000) (996,250)
Net financial instruments (1,052,535) (969,149)
Foreign currency contracts [Member]    
Disclosure of detailed information about financial instruments [line items]    
Derivative assets 2,807 31,534
Derivative liabilities (51,058) (3,760)
Interest rate contracts [Member]    
Disclosure of detailed information about financial instruments [line items]    
Derivative assets   564
Derivative liabilities (7,284) (1,237)
Level 2 of fair value hierarchy [member]    
Disclosure of detailed information about financial instruments [line items]    
Long-term debt (1,014,010) (1,103,978)
Net financial instruments (1,069,545) (1,076,877)
Level 2 of fair value hierarchy [member] | Foreign currency contracts [Member]    
Disclosure of detailed information about financial instruments [line items]    
Derivative assets 2,807 31,534
Derivative liabilities (51,058) (3,760)
Level 2 of fair value hierarchy [member] | Interest rate contracts [Member]    
Disclosure of detailed information about financial instruments [line items]    
Derivative assets   564
Derivative liabilities $ (7,284) $ (1,237)