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Related parties (Details)
 12 Months Ended
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Disclosure of transactions between related parties [line items]          
Short-term employee benefits $ 24,821,000   $ 26,569,000    
Share-based compensation 12,796,000   11,525,000    
Post-employment benefits 4,323,000   5,914,000    
Termination benefits 860,000   916,000    
Total compensation 42,800,000   44,924,000    
Advances receivable from JV Inkai LLP 124,533,000   $ 58,820,000    
Cameco [member]          
Disclosure of transactions between related parties [line items]          
Percentage of related party amounts receivable     40.00%   40.00%
Interest income 5,603,000   $ 2,182,000    
Purchases $ 94,063,000 $ 72,007,000      
Key management personnel of entity or parent [member]          
Disclosure of transactions between related parties [line items]          
Description of any retirement benefit plan termination terms Upon resignation at the Company’s request, they are entitled to termination benefits of up to the lesser of 18 to 24 months or the period remaining until age 65. The termination benefits include gross salary plus the target short-term incentive bonus for the year in which termination occurs Upon resignation at the Company’s request, they are entitled to termination benefits of up to the lesser of 18 to 24 months or the period remaining until age 65. The termination benefits include gross salary plus the target short-term incentive bonus for the year in which termination occurs      
Inkai [Member]          
Disclosure of transactions between related parties [line items]          
Loan facilities       $ 175,000,000  
Interest rate basis LIBOR plus 2% LIBOR plus 2%      
Loan oustanding       $ 91,320,000 $ 117,218,000