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Other income (expense) - Narrative (Details) - CAD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of significant investments in associates [Line Items] |  |  |  |
Gain on restructuring of JV Inkai | $ 0 | $ 48,570,000 | [1] |
Reclassification of foreign currency translation reserve to net earnings | 0 | 5,450,000 |  |
Disclosure of financial assets [line items] |  |  |  |
Sale of exploration interests | $ 0 | 25,027,000 | [2] |
Denison [Member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Sale of exploration interests |  | $ 17,231,000 |  |
Number of shares owned |  | 24,615,000 |  |
JV Inkai Associate [Member] |  |  |  |
Disclosure of significant investments in associates [Line Items] |  |  |  |
Ownership |  | 40.00% |  | 60.00%
[1] | Effective January 1, 2018, Cameco’s ownership interest in JV Inkai was reduced from 60 % to 40 % based on an implementation agreement with Kazatomprom. Cameco recognized a gain on the change in ownership interests of $ 48,570,000 . Included in this gain is $ 5,450,000 which has been reclassified from the foreign c urrency translation reserve to net earnings .
[2] | In 2018, Cameco sold its interest in the Wheeler River Joint Venture to Denison Mines Corp. in exchange for 24,615,000 common shares (note 10 ). Cameco recorded a gain of $ 17,231,000 on the transaction

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