XML 140 R81.htm IDEA: XBRL DOCUMENT v3.19.1
Provisions (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Provisions [Line Items]    
Beginning of year $ 913,540,000  
Changes in estimates and discont rates [Abstract]    
Capitalized in property, plant and equipment 72,701,000  
Recognized in earnings 61,306,000  
Change to equity accounting (3,049,000)  
Provisions used during the period (31,311,000)  
Unwinding of discount 23,681,000  
Effect of movements in exchange rates 26,484,000  
End of period 1,063,352,000  
Current 52,316,000 $ 38,507,000
Non-current 1,011,036,000 875,033,000
Outstanding letters of credit facility 1,572,984,000 1,474,155,000
Reclamation [Member]    
Provisions [Line Items]    
Beginning of year 905,400,000  
Changes in estimates and discont rates [Abstract]    
Capitalized in property, plant and equipment 72,701,000  
Recognized in earnings 59,616,000  
Change to equity accounting (3,049,000)  
Provisions used during the period (30,771,000)  
Unwinding of discount 23,511,000  
Effect of movements in exchange rates 26,484,000  
End of period 1,053,892,000  
Current 51,171,000  
Non-current 1,002,721,000  
Estimated total future decommissioning and reclamation costs $ 1,157,208,000 1,051,746,000
Description of period, majority of expenditures will occur 2023  
Outstanding letters of credit facility $ 1,050,546,000 1,011,613,000
Reclamation [Member] | Uranium [Member]    
Provisions [Line Items]    
Beginning of year 669,835,000  
Changes in estimates and discont rates [Abstract]    
End of period 828,781,000  
Reclamation [Member] | Fuel Services [Member]    
Provisions [Line Items]    
Beginning of year 235,565,000  
Changes in estimates and discont rates [Abstract]    
End of period 225,111,000  
Waste Disposal [Member]    
Provisions [Line Items]    
Beginning of year 8,140,000  
Changes in estimates and discont rates [Abstract]    
Capitalized in property, plant and equipment 0  
Recognized in earnings 1,690,000  
Change to equity accounting 0  
Provisions used during the period (540,000)  
Unwinding of discount 170,000  
Effect of movements in exchange rates 0  
End of period 9,460,000  
Current 1,145,000  
Non-current 8,315,000  
Waste Disposal [Member] | Fuel Services [Member]    
Changes in estimates and discont rates [Abstract]    
Estimated total future decommissioning and reclamation costs $ 9,617,000 $ 8,239,000,000