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Royalty, stream and working interests - Impairments of Royalties, Streams and Working Interests (Details)
 1 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
$ / bbl
$ / $
Nov. 13, 2012
Royalty, stream and working interests        
Impairment of royalty, streams and working interests $ 271,700,000 $ 271,700,000 $ 262,100,000  
Recoverable amount 476,700,000 476,700,000    
Edmonton Light prices (in US $/ barrels) | $ / bbl     8.55  
Exchange rate (US $ / Canadian dollar) | $ / $     0.72  
WTI oil price increase (as percentage)     2.00%  
Increase (Decrease) to impairment charges due to 1% increase in discount rate     $ 51,000,000  
Increase (Decrease) to impairment charges due to 1% decrease in discount rate     (59,000,000)  
Increase (Decrease) to impairment charges due to 10% increase in WTI oil prices     (76,300,000)  
Increase (Decrease) to impairment charges due to 10% decrease in WTI oil prices     77,600,000  
Remainder of 2020        
Royalty, stream and working interests        
WTI oil price (in US $/ barrels)     30.00  
2021        
Royalty, stream and working interests        
WTI oil price (in US $/ barrels)     41.18  
2022        
Royalty, stream and working interests        
WTI oil price (in US $/ barrels)     49.88  
2023        
Royalty, stream and working interests        
WTI oil price (in US $/ barrels)     55.87  
2024        
Royalty, stream and working interests        
WTI oil price (in US $/ barrels)     57.98  
SCOOP/STACK        
Royalty, stream and working interests        
Impairment of royalty, streams and working interests   207,200,000    
Recoverable amount 309,200,000 309,200,000    
Increase (Decrease) to impairment charges due to 1% increase in discount rate     34,100,000  
Increase (Decrease) to impairment charges due to 1% decrease in discount rate     (39,900,000)  
Increase (Decrease) to impairment charges due to 10% increase in WTI oil prices     (37,300,000)  
Increase (Decrease) to impairment charges due to 10% decrease in WTI oil prices     $ 37,800,000  
Weyburn        
Royalty, stream and working interests        
Percentage of NRI       11.71%
Percentage of ORR     0.44%  
Percentage of WI     2.56%  
Impairment of royalty, streams and working interests   60,500,000    
Recoverable amount 162,800,000 162,800,000    
Change in discount rate assumption for impairment analysis (as a percent)     9.50%  
Oil well equipment        
Royalty, stream and working interests        
Impairment of royalty, streams and working interests   4,000,000    
Recoverable amount $ 4,700,000 $ 4,700,000    
Weyburn and oil well equipment        
Royalty, stream and working interests        
Increase (Decrease) to impairment charges due to 1% increase in discount rate     $ 16,900,000  
Increase (Decrease) to impairment charges due to 1% decrease in discount rate     (19,100,000)  
Increase (Decrease) to impairment charges due to 10% increase in WTI oil prices     (39,000,000)  
Increase (Decrease) to impairment charges due to 10% decrease in WTI oil prices     $ 39,800,000  
Bottom | SCOOP/STACK        
Royalty, stream and working interests        
Change in discount rate assumption for impairment analysis (as a percent)     5.00%  
Top | SCOOP/STACK        
Royalty, stream and working interests        
Change in discount rate assumption for impairment analysis (as a percent)     12.00%