v3.26.1
Equity-accounted investees (Associate statement of earnings) (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of significant investments in associates [Line Items]    
Revenue from products and services $ 3,481,933 $ 3,135,772
Cost of products and services sold (2,218,566) (2,072,488)
Depreciation and amortization (293,094) (280,702)
Finance income 23,172 21,228
Finance costs (115,175) (147,171)
Income tax expense (recovery) (187,719) (84,874)
Net earnings 589,542 171,842
Other comprehensive income 50,462 151,485
Total comprehensive income (loss) 640,004 323,327
Joint Venture Inkai LLP [Member]    
Disclosure of significant investments in associates [Line Items]    
Revenue from products and services 891,786 934,759
Cost of products and services sold (204,998) (147,103)
Depreciation and amortization (56,909) (57,739)
Finance income 5,482 3,010
Finance costs (520) (704)
Other expense (52,355) (13,453)
Income tax expense (recovery) (116,555) (143,974)
Net earnings 465,931 574,796
Other comprehensive income 0 0
Total comprehensive income (loss) 465,931 574,796
Westinghouse Electric Company [Member]    
Disclosure of significant investments in associates [Line Items]    
Revenue from products and services 7,056,393 5,902,993
Cost of products and services sold (4,640,948) (4,235,079)
Depreciation and amortization (782,112) (728,294)
Marketing, administrative and general expenses (848,993) (821,322)
Finance income 5,147 8,941
Finance costs (434,797) (459,567)
Other expense (244,972) (238,158)
Income tax expense (recovery) 7,678 124,717
Net earnings 117,396 (445,769)
Other comprehensive income 249,464 42,506
Total comprehensive income (loss) $ 366,860 $ (403,263)