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Income taxes (Narratives) (Details) - CAD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Provisions [Line Items] |  |
Corresponding increase in tax expense | $ 33,546,000 | $ 7,673,000
Letters of credit outstanding | 1,383,689,000 | 1,593,379,000
Income taxes refunded | (70,372,000) | $ 1,521,000
Revised CRA reassessment position, amount released of cash held on account | $ 86,000,000 |

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- Definition The cash flows from income taxes paid or refunded, classified as operating activities. [Refer: Income taxes paid (refund)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 35 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 14 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_14_f&doctype=Standard -URIDate 2023-03-23 + Details
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