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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

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