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Joint operations (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of joint operations [line items]    
Total assets $ 7,427,248 $ 8,018,636
Joint operations [member]    
Disclosure of joint operations [line items]    
Total assets 2,925,279 3,106,658
Total liabilities $ 307,090 293,676
McArthur River [Member]    
Disclosure of joint operations [line items]    
Ownership 69.81%  
Principal place of business Canada  
Total assets $ 1,046,556 1,065,562
Total liabilities $ 32,132 32,829
Key Lake [Member]    
Disclosure of joint operations [line items]    
Ownership 83.33%  
Principal place of business Canada  
Total assets $ 524,324 537,233
Total liabilities $ 227,562 222,369
Cigar Lake [Member]    
Disclosure of joint operations [line items]    
Ownership 50.03%  
Principal place of business Canada  
Total assets $ 1,354,399 1,503,863
Total liabilities $ 47,396 $ 38,478