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Joint operations (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of joint operations [line items]    
Total assets $ 7,580,831 $ 7,427,248
Joint operations [member]    
Disclosure of joint operations [line items]    
Total assets 2,916,418 2,925,279
Total liabilities $ 359,532 307,090
McArthur River [Member]    
Disclosure of joint operations [line items]    
Ownership 69.81%  
Principal place of business Canada  
Total assets $ 1,027,617 1,046,556
Total liabilities $ 34,597 32,132
Key Lake [Member]    
Disclosure of joint operations [line items]    
Ownership 83.33%  
Principal place of business Canada  
Total assets $ 560,845 524,324
Total liabilities $ 278,331 227,562
Cigar Lake [Member]    
Disclosure of joint operations [line items]    
Ownership 50.03%  
Principal place of business Canada  
Total assets $ 1,327,956 1,354,399
Total liabilities $ 46,604 $ 47,396