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Royalty, stream and working interests - Impairments of Royalties, Streams and Working Interests (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Nov. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
item
$ / shares
$ / bbl
Nov. 13, 2012
Impairments          
Impairment of royalty, streams and working interests     $ 271,700,000 $ 271,700,000  
Recoverable amount of cash generating unit       $ 476,700,000  
Edmonton Light prices (in US $/ barrels) | $ / bbl       8.55  
Exchange rate (US $ / Canadian dollar) | $ / shares       $ 0.72  
WTI oil price increase (as percentage)       2.00%  
Discount Rate increase (Percentage)       1.00%  
Discount Rate decrease (Percentage)       1.00%  
WTI Oil Price decrease (Percentage)       10.00%  
WTI Oil Price increase (Percentage)       10.00%  
Increase (Decrease) to impairment charges due to 1% increase in discount rate       $ 51.0  
Increase (Decrease) to impairment charges due to 1% decrease in discount rate       (59.0)  
Increase (Decrease) to impairment charges due to 10% increase in WTI oil prices       77.6  
Increase (Decrease) to impairment charges due to 10% decrease in WTI oil prices       (76.3)  
Remainder of 2020          
Impairments          
WTI oil price (in US $/ barrels)       30.00  
2021          
Impairments          
WTI oil price (in US $/ barrels)       41.18  
2022          
Impairments          
WTI oil price (in US $/ barrels)       49.88  
2023          
Impairments          
WTI oil price (in US $/ barrels)       55.87  
2024          
Impairments          
WTI oil price (in US $/ barrels)       $ 57.98  
SCOOP/STACK          
Impairments          
Number of package acquired | item       2  
Royalty rights acquired $ 27,600,000 $ 100,000,000      
Impairment of royalty, streams and working interests       $ 207,200,000  
Recoverable amount of cash generating unit       309,200,000  
Increase (Decrease) to impairment charges due to 1% increase in discount rate       34.1  
Increase (Decrease) to impairment charges due to 1% decrease in discount rate       (39.9)  
Increase (Decrease) to impairment charges due to 10% increase in WTI oil prices       37.8  
Increase (Decrease) to impairment charges due to 10% decrease in WTI oil prices       $ (37.3)  
Weyburn          
Impairments          
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 of cash generating unit       $ 162,800,000  
Change In Discount Rate Assumptions Applied To Cash Flow Projection Impairment Analysis       9.50%  
Change in discount rate assumption for impairment analysis (as a percent)       9.50%  
Oil well equipment          
Impairments          
Impairment of royalty, streams and working interests       $ 4,000,000  
Recoverable amount of cash generating unit       4,700,000  
Weyburn and oil well equipment          
Impairments          
Increase (Decrease) to impairment charges due to 1% increase in discount rate       16.9  
Increase (Decrease) to impairment charges due to 1% decrease in discount rate       (19.1)  
Increase (Decrease) to impairment charges due to 10% increase in WTI oil prices       39.8  
Increase (Decrease) to impairment charges due to 10% decrease in WTI oil prices       $ (39.0)  
Bottom | SCOOP/STACK          
Impairments          
Change In Discount Rate Assumptions Applied To Cash Flow Projection Impairment Analysis       5.00%  
Change in discount rate assumption for impairment analysis (as a percent)       5.00%  
Top | SCOOP/STACK          
Impairments          
Change In Discount Rate Assumptions Applied To Cash Flow Projection Impairment Analysis       12.00%  
Change in discount rate assumption for impairment analysis (as a percent)       12.00%