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Financial instruments - Derivatives (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items] |  |
Net | $ (2,020) | $ (57,506)
Gain (loss) | 32,269 | (81,081)
Current portion of other liabilities [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net | (7,505) | (35,534)
Other liabilities [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net | (5,019) | (25,853)
Current portion of long-term receivables, investments and other [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net | 4,144 | 1,028
Long-term receivables, investments and other [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net | 6,360 | 2,853
Foreign currency contracts [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net | (4,333) | (52,665)
Gain (loss) | 31,863 | (85,967)
Interest rate swap contracts [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net | 2,313 | 857
Gain (loss) | 2,068 | 2,032
Uranium contracts [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net | 0 | (5,698)
Gain (loss) | $ (1,662) | $ 2,854

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- Definition The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_85&doctype=Standard -URIDate 2019-03-27 + Details
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