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Financial instruments - Derivatives (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]    
Net $ (57,506) $ 17,390
Gain (loss) (81,081) 56,250
Current portion of other liabilities [member]    
Disclosure of detailed information about financial instruments [line items]    
Net (35,534) (11,249)
Other liabilities [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net (25,853) (12,165)
Current portion of long-term receivables, investments and other [member]    
Disclosure of detailed information about financial instruments [line items]    
Net 1,028 25,948
Long-term receivables, investments and other [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net 2,853 14,856
Foreign currency contracts [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net (52,665) 34,360
Gain (loss) (85,967) 58,983
Interest rate swap contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Net 857 (150)
Gain (loss) 2,032 (4,014)
Uranium contracts [Member]    
Disclosure of detailed information about financial instruments [line items]    
Net (5,698) (16,820)
Gain (loss) $ 2,854 $ 1,281