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Long-term receivables, investments and other (Long-term receivables, investments and other) (Details)
 12 Months Ended
Dec. 31, 2022
CAD ($)
lb
kg
Dec. 31, 2021
CAD ($)
lb
Categories Of Noncurrent Financial Assets [Abstract]    
Deferred charges $ 29,585,000 $ 0
Derivatives 2,807,000 32,098,000
Investment tax credits 95,812,000 95,722,000
Amounts receivable related to tax dispute 295,221,000 295,221,000
Product loan 200,998,000 176,904,000
Other 3,264,000 814,000
Total (current and non current portion) 627,687,000 600,759,000
Less current portion (32,180,000) (23,232,000)
Net $ 595,507,000 $ 577,527,000
Uranium [member] | Orano Canada Inc [member]    
Disclosure of products and services [line items]    
Product loan maturity December 31, 2028  
Product loan quantity | lb 3,571,001 5,400,000
Repayment on loan receivable | lb 1,828,999  
Undrawn Loan Receivables Quantity | lb 1,200,000  
Undrawn Loan Maturity Date December 31, 2027  
Uranium conversion supply [member] | Orano Canada Inc [member]    
Disclosure of products and services [line items]    
Product loan maturity December 31, 2035  
Product loan quantity | kg 700,000  
Maximum quantity of raw materials | kg 1,148,200