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Equity-accounted investee - Associate statement of earnings (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of significant investments in associates [Line Items]    
Revenue from products and services $ 1,800,073 $ 1,862,925
Cost of products and services sold (1,484,962) (1,345,551)
Depreciation and amortization (208,662) (275,749)
Finance income 10,835 29,760
Finance costs (96,133) (98,622)
Income tax expense (13,666) (61,077)
Net earnings (loss) (53,197) 73,941
Other comprehensive income (loss) 38,795 (40,753)
Total comprehensive income (loss) (14,402) 33,188
JV Inkai [Member]    
Disclosure of significant investments in associates [Line Items]    
Revenue from products and services 252,764 261,860
Cost of products and services sold (57,358) (64,199)
Depreciation and amortization (24,081) (27,740)
Finance income 367 651
Finance costs (825) (2,939)
Other expense (12,305) (23,767)
Income tax expense (44,804) (30,999)
Net earnings (loss) 113,758 112,867
Other comprehensive income (loss) (97) (1,773)
Total comprehensive income (loss) $ 113,661 $ 111,094