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Income Taxes - Provision For Income Taxes (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Net income (loss) before income taxes $ 373,290 $ (516,582)
Expected income taxes at the statutory rate $ 91,008 $ (127,286)
Tax rate 24.38% 24.64%
Increase (decrease) in income taxes resulting from:    
Effect of foreign exchange $ 19,354 $ (2,089)
Effect of change in statutory rates 8,287 0
Effect of rate adjustments for foreign jurisdictions (8,187) 5,062
Effect of change in deferred tax benefit not recognized (6,349) 6,347
Effect of internal debt restructuring 0 (186,460)
Repatriation and related taxes 24,914 13,565
Adjustments, assessments and other 7,666 7,635
Income tax expense (recovery) 136,693 (283,226)
Deferred tax assets, unrecognized $ 31,800 $ 40,400