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Financial instruments - Derivatives (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Net $ (2,020) $ (57,506)
Gain (loss) 32,269 (81,081)
Current portion of other liabilities [member]    
Disclosure of detailed information about financial instruments [line items]    
Net (7,505) (35,534)
Other liabilities [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net (5,019) (25,853)
Current portion of long-term receivables, investments and other [member]    
Disclosure of detailed information about financial instruments [line items]    
Net 4,144 1,028
Long-term receivables, investments and other [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net 6,360 2,853
Foreign currency contracts [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net (4,333) (52,665)
Gain (loss) 31,863 (85,967)
Interest rate swap contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Net 2,313 857
Gain (loss) 2,068 2,032
Uranium contracts [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net 0 (5,698)
Gain (loss) $ (1,662) $ 2,854