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Joint operations (Joint operations proportionate interest in net assets table) (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of joint operations [line items]    
Total assets $ 9,907,007 $ 9,934,057
McArthur River [Member]    
Disclosure of joint operations [line items]    
Ownership 69.81%  
Principal place of business Canada  
Total assets $ 963,183 1,048,746
Total liabilities $ 53,373 50,199
Key Lake [Member]    
Disclosure of joint operations [line items]    
Ownership 83.33%  
Principal place of business Canada  
Total assets $ 485,635 504,508
Total liabilities $ 248,107 244,480
Cigar Lake [Member]    
Disclosure of joint operations [line items]    
Ownership 54.55%  
Principal place of business Canada  
Total assets $ 1,010,646 1,158,583
Total liabilities 57,125 48,967
Joint Operations [Member]    
Disclosure of joint operations [line items]    
Total assets 2,459,464 2,711,837
Total liabilities $ 358,605 $ 343,646