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Provisions (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Provisions [Line Items]    
Beginning of year $ 1,060,478,000  
Changes in estimates and discont rates [Abstract]    
Capitalized in property, plant and equipment 127,637,000  
Recognized in earnings 23,771,000  
Provisions used during the period (17,640,000)  
Unwinding of discount 14,403,000  
Effect of movements in exchange rates (9,727,000)  
End of period 1,198,922,000  
Current 42,535,000 $ 56,248,000
Non-current 1,156,387,000 1,004,230,000
Outstanding letters of credit facility 1,596,488,000 1,528,603,000
Reclamation [Member]    
Provisions [Line Items]    
Beginning of year 1,050,675,000  
Changes in estimates and discont rates [Abstract]    
Capitalized in property, plant and equipment 127,637,000  
Recognized in earnings 23,921,000  
Provisions used during the period (17,272,000)  
Unwinding of discount 14,366,000  
Effect of movements in exchange rates (9,727,000)  
End of period 1,189,600,000  
Current 40,760,000  
Non-current 1,148,840,000  
Estimated total future decommissioning and reclamation costs $ 1,130,495,000 1,127,487,000
Description of period, majority of expenditures will occur after 2026  
Outstanding letters of credit facility $ 1,021,142,000 994,129,000
Reclamation [Member] | Uranium [Member]    
Provisions [Line Items]    
Beginning of year 831,352,000  
Changes in estimates and discont rates [Abstract]    
End of period 937,992,000  
Reclamation [Member] | Fuel Services [Member]    
Provisions [Line Items]    
Beginning of year 219,323,000  
Changes in estimates and discont rates [Abstract]    
End of period 251,608,000  
Waste Disposal [Member]    
Provisions [Line Items]    
Beginning of year 9,803,000  
Changes in estimates and discont rates [Abstract]    
Capitalized in property, plant and equipment 0  
Recognized in earnings (150,000)  
Provisions used during the period (368,000)  
Unwinding of discount 37,000  
Effect of movements in exchange rates 0  
End of period 9,322,000  
Current 1,775,000  
Non-current 7,547,000  
Waste Disposal [Member] | Fuel Services [Member]    
Changes in estimates and discont rates [Abstract]    
Estimated total future decommissioning and reclamation costs $ 8,044,000 $ 8,451,000