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Other investments (Narrative) (Details)
$ / shares in Units, $ in Thousands, $ in Millions
 1 Months Ended 12 Months Ended
Sep. 30, 2023
CAD ($)
Sep. 30, 2023
USD ($)
Jan. 31, 2023
CAD ($)
$ / shares
Rate
Dec. 31, 2023
CAD ($)
Jun. 30, 2023
CAD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
CAD ($)
$ / shares
Rate
Disclosure of detailed information about borrowings [line items]              
Interest receivable       $ 1,253     $ 8,834
Falco Resources Ltd. [Member] | Convertible Secured Senior [Member]              
Disclosure of detailed information about borrowings [line items]              
Face amount of note     $ 17,600        
Interest receivable     $ 2,900        
Note interest rate | Rate     8.00%       7.00%
Conversion price | $ / shares     $ 0.5       $ 0.55
Reduction in fair value of note     $ 11,600        
Stornoway Diamond Corporation [Member]              
Disclosure of detailed information about borrowings [line items]              
Interest receivable         $ 4,800    
Allowance for expected credit loss against loans receivable         13,300 $ 10.0  
Loans receivable net of income taxes         11,500    
Allowance for expected credit loss against accrued interest         6,600 5.0  
Expected credit loss         $ 19,900 $ 15.0  
Loan wrote-off $ 17,300 $ 12.8          
Loan wrote-off net of income tax $ 15,000            
Provision for loans       $ 30,600