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Provisions (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Provisions [Line Items]    
Beginning of year $ 1,063,352,000  
Changes in estimates and discont rates [Abstract]    
Capitalized in property, plant and equipment 22,151,000  
Recognized in earnings 3,377,000  
Provisions used during the period (32,390,000) $ (31,311,000)
Unwinding of discount 20,789,000  
Effect of movements in exchange rates (16,801,000)  
End of period 1,060,478,000 1,063,352,000
Current 56,248,000 52,316,000
Non-current 1,004,230,000 1,011,036,000
Outstanding letters of credit facility 1,528,603,000 1,572,984,000
Reclamation [Member]    
Provisions [Line Items]    
Beginning of year 1,053,892,000  
Changes in estimates and discont rates [Abstract]    
Capitalized in property, plant and equipment 22,151,000  
Recognized in earnings 2,732,000  
Provisions used during the period (31,933,000)  
Unwinding of discount 20,634,000  
Effect of movements in exchange rates (16,801,000)  
End of period 1,050,675,000 1,053,892,000
Current 54,806,000  
Non-current 995,869,000  
Estimated total future decommissioning and reclamation costs $ 1,127,487,000 1,157,208,000
Description of period, majority of expenditures will occur 2024  
Outstanding letters of credit facility $ 994,129,000 1,050,546,000
Reclamation [Member] | Uranium [Member]    
Provisions [Line Items]    
Beginning of year 828,781,000  
Changes in estimates and discont rates [Abstract]    
End of period 831,352,000 828,781,000
Reclamation [Member] | Fuel Services [Member]    
Provisions [Line Items]    
Beginning of year 225,111,000  
Changes in estimates and discont rates [Abstract]    
End of period 219,323,000 225,111,000
Waste Disposal [Member]    
Provisions [Line Items]    
Beginning of year 9,460,000  
Changes in estimates and discont rates [Abstract]    
Capitalized in property, plant and equipment 0  
Recognized in earnings 645,000  
Provisions used during the period (457,000)  
Unwinding of discount 155,000  
Effect of movements in exchange rates 0  
End of period 9,803,000 9,460,000
Current 1,442,000  
Non-current 8,361,000  
Waste Disposal [Member] | Fuel Services [Member]    
Changes in estimates and discont rates [Abstract]    
Estimated total future decommissioning and reclamation costs $ 8,451,000 $ 9,617,000