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Provisions (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Provisions [Line Items]    
Beginning of year $ 1,136,374,000  
Changes in estimates and discont rates [Abstract]    
Capitalized in property, plant and equipment (116,395,000)  
Recognized in earnings 24,508,000  
Acquisitions 2,528,000  
Provisions used during the period (28,492,000)  
Unwinding of discount 28,979,000  
Effect of movements in exchange rates 23,528,000  
End of period 1,071,030,000  
Current 48,305,000 $ 46,365,000
Non-current 1,022,725,000 1,090,009,000
Outstanding letters of credit facility 1,593,379,000 1,573,873,000
Reclamation [Member]    
Provisions [Line Items]    
Beginning of year 1,126,969,000  
Changes in estimates and discont rates [Abstract]    
Capitalized in property, plant and equipment (116,395,000)  
Recognized in earnings 22,944,000  
Acquisitions 2,528,000  
Provisions used during the period (27,159,000)  
Unwinding of discount 28,681,000  
Effect of movements in exchange rates 23,528,000  
End of period 1,061,096,000  
Current 46,004,000  
Non-current 1,015,092,000  
Estimated total future decommissioning and reclamation costs $ 1,356,092,000 1,100,378,000
Description of period, majority of expenditures will occur after 2028  
Outstanding letters of credit facility $ 1,035,348,000 1,007,009,000
Changes In Other Provisions 90,923,000  
Reclamation [Member] | Uranium [member]    
Provisions [Line Items]    
Beginning of year 900,482,000  
Changes in estimates and discont rates [Abstract]    
End of period 870,877,000  
Reclamation [Member] | Fuel Services [Member]    
Provisions [Line Items]    
Beginning of year 226,487,000  
Changes in estimates and discont rates [Abstract]    
End of period 190,219,000  
Waste Disposal [Member]    
Provisions [Line Items]    
Beginning of year 9,405,000  
Changes in estimates and discont rates [Abstract]    
Capitalized in property, plant and equipment 0  
Recognized in earnings 1,564,000  
Acquisitions 0  
Provisions used during the period (1,333,000)  
Unwinding of discount 298,000  
Effect of movements in exchange rates 0  
End of period 9,934,000  
Current 2,301,000  
Non-current 7,633,000  
Waste Disposal [Member] | Fuel Services [Member]    
Changes in estimates and discont rates [Abstract]    
Estimated total future decommissioning and reclamation costs $ 8,919,000 $ 8,169,000