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Investments in affiliates and joint ventures - Accounts Payable and Receivables from Joint Ventures and Affiliates (Details) - CAD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Schedule of Equity Method Investments [Line Items] |  |
Accounts receivable | $ 166,070 | $ 97,855
Contract assets | 4,135 | 35,027
Other assets | 9,845 | 7,144
Accounts payable | 110,750 | 146,190
Accrued liabilities | 77,908 | 72,225
Equity Method Investee |  |
Schedule of Equity Method Investments [Line Items] |  |
Accounts receivable | 73,928 | 41,157
Contract assets | 2,619 | 12,019
Other assets | 112 | 350
Accounts payable | 12,660 | 3,203
Accrued liabilities | $ 9,070 | $ 11,884

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