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Interests in Resource Properties - assets included in non-current assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Interests In Resource Properties [Roll Forward]    
Opening balance $ 254,706  
Ending balance 201,802 $ 254,706
Gross carrying amount    
Disclosure Of Interests In Resource Properties [Roll Forward]    
Opening balance 264,795 263,957
Decommissioning obligations 1,339 838
Reclassification to assets held for sale (47,931)  
Ending balance 218,203 264,795
Accumulated depreciation    
Disclosure Of Interests In Resource Properties [Roll Forward]    
Opening balance 27,096 19,609
Additions 7,196 7,487
Reclassification to assets held for sale (17,891)  
Ending balance 16,401 27,096
Interest in iron ore mine and hydrocarbon development and production assets    
Disclosure Of Interests In Resource Properties [Roll Forward]    
Opening balance 237,699 244,348
Ending balance 201,802 237,699
Interest in an iron ore development project    
Disclosure Of Interests In Resource Properties [Roll Forward]    
Opening balance 206,439  
Ending balance 201,802 206,439
Interest in an iron ore development project | Gross carrying amount    
Disclosure Of Interests In Resource Properties [Roll Forward]    
Opening balance 218,203 218,203
Decommissioning obligations 0 0
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 11,764 6,853
Additions 4,637 4,911
Reclassification to assets held for sale 0  
Ending balance 16,401 11,764
Hydrocarbon development and production assets    
Disclosure Of Interests In Resource Properties [Roll Forward]    
Opening balance 31,260  
Ending balance   31,260
Hydrocarbon development and production assets | Gross carrying amount    
Disclosure Of Interests In Resource Properties [Roll Forward]    
Opening balance 46,592 45,754
Decommissioning obligations 1,339 838
Reclassification to assets held for sale (47,931)  
Ending balance   46,592
Hydrocarbon development and production assets | Accumulated depreciation    
Disclosure Of Interests In Resource Properties [Roll Forward]    
Opening balance 15,332 12,756
Additions 2,559 2,576
Reclassification to assets held for sale (17,891)  
Ending balance $ 0 $ 15,332