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Equity-accounted investee (Associate statement of earnings) (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of significant investments in associates [Line Items]    
Revenue from products and services $ 1,868,003 $ 1,474,984
Cost of products and services sold (1,457,336) (1,282,635)
Depreciation and amortization (177,376) (190,415)
Finance income 37,499 6,804
Finance costs (85,728) (76,612)
Income tax expense 4,469 1,201
Net earnings (loss) 89,264 (102,654)
Other comprehensive loss, net of taxes (18,899) (4,428)
Total comprehensive income (loss) 70,365 (107,082)
JV Inkai [Member]    
Disclosure of significant investments in associates [Line Items]    
Revenue from products and services 476,354 387,319
Cost of products and services sold (66,119) (55,397)
Depreciation and amortization (24,749) (25,300)
Finance income 1,341 349
Finance costs (2,635) (796)
Other expense (30,770) (16,636)
Income tax expense (74,763) (60,357)
Net earnings (loss) 278,659 229,182
Total comprehensive income (loss) $ 278,659 $ 229,182