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Royalty, stream and other interests - Disclosure of detailed information about royalty interests (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Royalty, Stream And Other Interests [Line Items]    
Beginning balance $ 1,116,128 $ 1,130,512
Additions 90,936 66,193
Conversion of an offtake into a stream 0  
Disposal   (357)
Depletion (48,361) (45,605)
Impairment (2,288) (26,300)
Translation adjustments (1,614) (8,315)
Net book value - December 31 1,154,801 1,116,128
Royalty interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 656,661 627,567
Additions 77,702 54,276
Conversion of an offtake into a stream 0  
Disposal   (357)
Depletion (28,958) (23,159)
Impairment (2,288) 0
Translation adjustments (4) (1,666)
Net book value - December 31 703,113 656,661
Stream interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 440,941 483,164
Additions 13,234 11,917
Conversion of an offtake into a stream 4,682  
Disposal   0
Depletion (19,403) (21,532)
Impairment 0 (26,300)
Translation adjustments (1,422) (6,308)
Net book value - December 31 438,032 440,941
Offtake interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 18,526 19,781
Additions 0 0
Conversion of an offtake into a stream (4,682)  
Disposal   0
Depletion 0 (914)
Impairment 0 0
Translation adjustments (188) (341)
Net book value - December 31 13,656 18,526
Producing [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 582,822  
Cost 1,145,279 1,151,944
Accumulated depletion and impairment (606,758) (569,122)
Net book value - December 31 538,521 582,822
Producing [Member] | Royalty interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 254,271  
Cost 626,345 621,503
Accumulated depletion and impairment (395,874) (367,232)
Net book value - December 31 230,471 254,271
Producing [Member] | Stream interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 323,738  
Cost 518,934 512,019
Accumulated depletion and impairment (210,884) (188,281)
Net book value - December 31 308,050 323,738
Producing [Member] | Offtake interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 4,813  
Cost 0 18,422
Accumulated depletion and impairment 0 (13,609)
Net book value - December 31 0 4,813
Development [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 306,587  
Cost 438,767 385,070
Accumulated depletion and impairment (78,223) (78,483)
Net book value - December 31 360,544 306,587
Development [Member] | Royalty interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 184,669  
Cost 226,438 185,170
Accumulated depletion and impairment (572) (501)
Net book value - December 31 225,866 184,669
Development [Member] | Stream interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 117,203  
Cost 181,209 168,648
Accumulated depletion and impairment (51,227) (51,445)
Net book value - December 31 129,982 117,203
Development [Member] | Offtake interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 4,715  
Cost 31,120 31,252
Accumulated depletion and impairment (26,424) (26,537)
Net book value - December 31 4,696 4,715
Exploration and evaluation    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 226,719  
Cost 256,640 227,393
Accumulated depletion (904) (674)
Net book value - December 31 255,736 226,719
Exploration and evaluation | Royalty interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 217,721  
Cost 247,680 218,395
Accumulated depletion (904) (674)
Net book value - December 31 246,776 217,721
Exploration and evaluation | Stream interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 0  
Cost 0 0
Accumulated depletion 0 0
Net book value - December 31 0 0
Exploration and evaluation | Offtake interests [Member]    
Royalty, Stream And Other Interests [Line Items]    
Beginning balance 8,998  
Cost 8,960 8,998
Accumulated depletion 0 0
Net book value - December 31 $ 8,960 $ 8,998