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Other income (expense) - Narrative (Details) - CAD ($)
 12 Months Ended
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