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Royalty, stream and working interests - Impairments of Royalties, Streams and Working Interests (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2016
Impairments        
Number of assets with impairment indicators. | item 3      
Impairment of royalty, streams and working interests   $ 76,000,000    
Discount rate (as a percent)       5.00%
Change in gold price assumption for impairment analysis (as a percent) 10.00%      
Change in gold price assumption (as a percent) 10.00%      
Change in discount rate assumption for impairment analysis (as a percent)       3.00%
Levack-Morrison        
Impairments        
Impairment of royalty, streams and working interests   54,400,000    
Recoverable amount of cash generating unit $ 3,600,000      
Podolsky        
Impairments        
Impairment of royalty, streams and working interests   21,000,000    
Recoverable amount of cash generating unit 0      
McCreedy-West        
Impairments        
Recoverable amount of cash generating unit 11,000,000      
Exploration assets        
Impairments        
Impairment of royalty, streams and working interests   $ 600,000    
Key assumptions in the impairment testing analysis        
Impairments        
Long term gold price (in dollars per ounce) 1,284   $ 1,318  
Long term platinum price (in dollars per ounce) 864   931  
Long term palladium price (in dollars per ounce) $ 1,184   $ 1,137