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Financial instruments - Derivatives (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Net $ 40,872 $ (2,020)
Gain (loss) 36,577 32,269
Current portion of other liabilities [member]    
Disclosure of detailed information about financial instruments [line items]    
Net (1,658) (7,505)
Other liabilities [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net (3,075) (5,019)
Current portion of long-term receivables, investments and other [member]    
Disclosure of detailed information about financial instruments [line items]    
Net 16,466 4,144
Long-term receivables, investments and other [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net 29,139 6,360
Foreign currency contracts [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net 40,872 (4,333)
Gain (loss) 30,600 31,863
Interest rate swap contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Net 0 2,313
Gain (loss) 5,977 2,068
Uranium contracts [Member]    
Disclosure of detailed information about financial instruments [line items]    
Gain (loss) $ 0 $ (1,662)