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Share capital - Share Repurchase and Secondary Offering (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
CAD ($)
Disclosure of classes of share capital [line items]  
Amount of Common shares acquired and cancelled through share repurchase $ 174,639
Share repurchase and secondary offering [Member]  
Disclosure of classes of share capital [line items]  
Amount of Common shares acquired and cancelled through share repurchase 174,600
Victoria Gold Corp. (associate) [Member]  
Disclosure of classes of share capital [line items]  
Amount of Common shares acquired and cancelled through share repurchase 71,400
Dalradian Resources Inc. (other investment) [Member]  
Disclosure of classes of share capital [line items]  
Amount of Common shares acquired and cancelled through share repurchase 58,100
Aquila Resources Inc. (associate) [Member]  
Disclosure of classes of share capital [line items]  
Amount of Common shares acquired and cancelled through share repurchase 9,700
Highland Copper Company Inc. (associate) [Member]  
Disclosure of classes of share capital [line items]  
Amount of Common shares acquired and cancelled through share repurchase 3,000
Other investments [Member]  
Disclosure of classes of share capital [line items]  
Amount of Common shares acquired and cancelled through share repurchase $ 32,400