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Provisions (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Provisions [Line Items]    
Beginning of year $ 1,061,984,000  
Changes in estimates and discount rates [Abstract]    
Capitalized in property, plant and equipment (17,308,000)  
Recognized in earnings (37,352,000)  
Provisions used during the period (34,746,000)  
Unwinding of discount 36,243,000  
Effect of movements in exchange rates 26,986,000  
End of period 1,035,807,000  
Current 37,974,000 $ 39,113,000
Non-current 997,833,000 1,022,871,000
Outstanding letters of credit facility 1,527,815,000 1,383,689,000
Reclamation [Member]    
Provisions [Line Items]    
Beginning of year 1,051,167,000  
Changes in estimates and discount rates [Abstract]    
Capitalized in property, plant and equipment (17,308,000)  
Recognized in earnings (37,683,000)  
Provisions used during the period (34,064,000)  
Unwinding of discount 35,941,000  
Effect of movements in exchange rates 26,986,000  
End of period 1,025,039,000  
Current 34,063,000  
Non-current 990,976,000  
Estimated total future decommissioning and reclamation costs $ 1,382,661,000 1,356,018,000
Description of period, majority of expenditures will occur after 2029  
Outstanding letters of credit facility $ 1,125,194,000 1,060,769,000
Reclamation [Member] | Uranium [Member]    
Provisions [Line Items]    
Beginning of year 874,773,000  
Changes in estimates and discount rates [Abstract]    
End of period 865,574,000  
Reclamation [Member] | Fuel Services [Member]    
Provisions [Line Items]    
Beginning of year 176,394,000  
Changes in estimates and discount rates [Abstract]    
End of period 159,465,000  
Waste Disposal [Member]    
Provisions [Line Items]    
Beginning of year 10,817,000  
Changes in estimates and discount rates [Abstract]    
Capitalized in property, plant and equipment 0  
Recognized in earnings 331,000  
Provisions used during the period (682,000)  
Unwinding of discount 302,000  
Effect of movements in exchange rates 0  
End of period 10,768,000  
Current 3,911,000  
Non-current $ 6,857,000  
Period in which majority of expenditures are expected to occur 3 years  
Waste Disposal [Member] | Fuel Services [Member]    
Changes in estimates and discount rates [Abstract]    
Estimated total future decommissioning and reclamation costs $ 9,663,000 $ 9,681,000