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Related parties (Details)
 12 Months Ended
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Disclosure of transactions between related parties [line items]          
Short-term employee benefits $ 21,676,000   $ 21,225,000    
Share-based compensation 26,230,000   12,034,000    
Post-employment benefits 6,041,000   5,542,000    
Termination benefits 430,000   272,000    
Total compensation 54,377,000   39,073,000    
Dividends from equity-accounted investee $ 54,404,000   14,079,000    
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%      
Interest income     1,878,000    
Loan oustanding $ 0       $ 0
Purchases 148,169,000 $ 111,886,000 112,861,000 $ 84,827,000  
Dividends from equity-accounted investee $ 54,404,000 $ 40,621,000 $ 14,079,000 $ 10,635,000