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Joint operations (Joint operations proportionate interest in net assets table) (Details) - CAD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure of joint operations [line items] |  |
Total assets | $ 9,907,007 | $ 9,934,057
McArthur River [Member] |  |
Disclosure of joint operations [line items] |  |
Ownership | 69.81% |
Principal place of business | Canada |
Total assets | $ 963,183 | 1,048,746
Total liabilities | $ 53,373 | 50,199
Key Lake [Member] |  |
Disclosure of joint operations [line items] |  |
Ownership | 83.33% |
Principal place of business | Canada |
Total assets | $ 485,635 | 504,508
Total liabilities | $ 248,107 | 244,480
Cigar Lake [Member] |  |
Disclosure of joint operations [line items] |  |
Ownership | 54.55% |
Principal place of business | Canada |
Total assets | $ 1,010,646 | 1,158,583
Total liabilities | 57,125 | 48,967
Joint Operations [Member] |  |
Disclosure of joint operations [line items] |  |
Total assets | 2,459,464 | 2,711,837
Total liabilities | $ 358,605 | $ 343,646

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