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Equity-accounted investee (Associate financial position) (Details) - CAD ($)
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of significant investments in associates [Line Items]      
Cash and cash equivalents $ 1,143,674,000 $ 1,247,447,000 $ 918,382,000
Non-current assets 5,311,157,000 5,376,192,000  
Current liabilities (560,841,000) (413,743,000)  
Non-current liabilities (2,235,887,000) (2,258,033,000)  
JV Inkai [Member]      
Disclosure of significant investments in associates [Line Items]      
Cash and cash equivalents 14,950,000 12,893,000  
Other current assets 373,868,000 301,589,000  
Non-current assets 334,954,000 328,469,000  
Current liabilities (34,606,000) (32,774,000)  
Non-current liabilities (37,644,000) (38,635,000)  
Net assets $ 651,522,000 $ 571,542,000 $ 440,565,000