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Interests in Resource Properties - assets included in non-current assets (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Interests In Resource Properties [Roll Forward]    
Opening balance $ 201,802  
Ending balance 196,634 $ 201,802
Gross carrying amount    
Disclosure Of Interests In Resource Properties [Roll Forward]    
Opening balance 218,203 264,795
Decommissioning obligations   1,339
Reclassification to assets held for sale   (47,931)
Ending balance   218,203
Accumulated depreciation    
Disclosure Of Interests In Resource Properties [Roll Forward]    
Opening balance 16,401 27,096
Additions   7,196
Reclassification to assets held for sale   (17,891)
Ending balance   16,401
Interest in iron ore mine and hydrocarbon development and production assets    
Disclosure Of Interests In Resource Properties [Roll Forward]    
Opening balance 201,802 237,699
Ending balance 196,634 201,802
Interest in an iron ore development project    
Disclosure Of Interests In Resource Properties [Roll Forward]    
Opening balance 201,802  
Ending balance 196,634 201,802
Interest in an iron ore development project | Gross carrying amount    
Disclosure Of Interests In Resource Properties [Roll Forward]    
Opening balance 218,203 218,203
Ending balance 218,203 218,203
Interest in an iron ore development project | Accumulated depreciation    
Disclosure Of Interests In Resource Properties [Roll Forward]    
Opening balance 16,401 11,764
Additions 5,168 4,637
Reclassification to assets held for sale   0
Ending balance 21,569 16,401
Hydrocarbon development and production assets | Gross carrying amount    
Disclosure Of Interests In Resource Properties [Roll Forward]    
Opening balance   46,592
Decommissioning obligations   1,339
Reclassification to assets held for sale   (47,931)
Hydrocarbon development and production assets | Accumulated depreciation    
Disclosure Of Interests In Resource Properties [Roll Forward]    
Opening balance $ 0 15,332
Additions   2,559
Reclassification to assets held for sale   (17,891)
Ending balance   $ 0