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Income taxes (Earnings and income taxes by jurisdiction) (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure of geographical areas [line items] |  |
Earnings (loss) before income taxes | $ 256,716 | $ 487,153
Current income taxes | 33,578 | 33,546
Deferred income taxes (recovery) | 51,296 | 92,791
Income tax expense | 84,874 | 126,337
Canada [member] |  |
Disclosure of geographical areas [line items] |  |
Earnings (loss) before income taxes | 401,080 | 562,139
Current income taxes | 24,149 | 26,230
Deferred income taxes (recovery) | 39,115 | 104,885
Foreign [Member] |  |
Disclosure of geographical areas [line items] |  |
Earnings (loss) before income taxes | (144,364) | (74,986)
Current income taxes | 9,429 | 7,316
Deferred income taxes (recovery) | 12,181 | (12,094)
Switzerland [Member] |  |
Disclosure of geographical areas [line items] |  |
Income tax expense | $ 4,005,000 | $ 0

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