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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

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