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

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- Definition The gain (loss) arising on the cessation of the consolidation of subsidiaries due to the change of investment entity status. [Refer: Disclosure of investment entities [text block]; Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 9B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_9B_b&doctype=Standard -URIDate 2018-03-16 + Details
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