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Share capital (Tables)
 12 Months Ended
Dec. 31, 2022
Disclosure of classes of share capital [abstract]  
Summary of share capital
20222021
Voting common sharesNumber of SharesTotalNumber of SharesTotal
Balance at January 1,182,673,118 $3,225,326 174,931,381$3,144,644 
Shares issued upon exercise of share options885,750 4,438 339,5401,738 
Shares issued on redemption of performance share units528,166 2,256 514,010 1,202 
Estimated fair value of share options exercised transferred from contributed surplus— 1,787 — 684 
Shares issued on acquisition of subsidiary— — 5,788,187 65,647 
Shares issued upon exercise of warrants19,037 213 — — 
Flow-through and other shares issued, net of issuance costs and premium694,500 7,624 1,100,000 11,411 
Balance at December 31,184,800,571 $3,241,644 182,673,118 $3,225,326