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Other income (expense) (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Other Income Expense [Abstract]    
Foreign exchange gains (losses) $ 26,205,000 $ (23,168,000)
Gain on restructuring of JV Inkai 48,570,000 [1] 0
Sale of exploration interests 25,027,000 [2] 0
Contract restructuring 6,201,000 0
Write off of long-term receivables 0 (5,926,000)
Other 2,157,000 (1,316,000)
Total other income (expense) $ 108,160,000 $ (30,410,000)
[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 currency translation reserve to net earnings .

[2]

In the fourth quarter of 2018, Cameco sold its interest in the Wheeler River Joint Venture to Denison Mines Corp. in exchange for 24,615,000 commo n shares (note 10 ). Cameco recorded a gain of $ 17,231,000 on the transaction.