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Acquisitions and other transactions (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Feb. 21, 2019
USD ($)
Jan. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Feb. 21, 2019
CAD ($)
South Central Oklahoma Oil Province And Sooner Trend Anadarko Basin Canadian And Kingfisher Countries          
Acquisitions          
Total contributions made     $ 35,100,000 $ 86,500,000  
Cumulative investment in royalty acquisition venture     348,300,000 348,300,000  
South Central Oklahoma Oil Province And Sooner Trend Anadarko Basin Canadian And Kingfisher Countries | Top          
Acquisitions          
Total cumulative investment     171,700,000 171,700,000  
South Central Oklahoma Oil Province And Sooner Trend Anadarko Basin Canadian And Kingfisher Countries | Accounts payable          
Acquisitions          
Total consideration transferred, acquisition-date fair value     $ 10,800,000 $ 10,800,000  
Salares Norte Royalty Interest          
Acquisitions          
Total consideration transferred, acquisition-date fair value   $ 32,000,000      
Percentage of NSR   2.00%      
Number of common shares issued in acquisition (in share)   366,499      
Cash transferred   $ 5,000,000      
Option to buy back of NSR (as a percent)   1.00%      
Value of option to buy back of NSR   $ 6,000,000      
Period to buy back of NSR   24 months      
Salares Norte Royalty Interest | Common shares          
Acquisitions          
Value of common shares issued in acquisition   $ 27,000,000      
Number of common shares issued in acquisition (in share)   366,499      
Valentine Lake Royalty Interest          
Acquisitions          
Total consideration transferred, acquisition-date fair value         $ 18.0
Percentage of NSR 2.00%        
Option to buy back of NSR (as a percent)         0.50%
Value of option to buy back of NSR $ 7,000,000