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Royalty, stream and working interests - Royalties, Streams and Working Interests (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net $ 4,423.8 $ 4,797.8 $ 4,555.6
Royalty, stream and working interest, net depletable 3,430.1 3,743.8  
Royalty, stream and working interest, net non-depletable 993.7 1,054.0  
Cost      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 7,397.4 7,407.8  
Accumulated Depletion      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net (2,705.9) (2,610.0)  
Impairment      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net (267.7)    
Mineral Royalties      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 405.6 415.6 450.1
Mineral Royalties | Cost      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 1,038.0 1,035.7  
Mineral Royalties | Accumulated Depletion      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net (632.4) (620.1)  
Streams      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 2,727.4 2,804.0 2,967.6
Streams | Cost      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 4,349.9 4,346.3  
Streams | Accumulated Depletion      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net (1,622.5) (1,542.3)  
Energy      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 1,070.5 1,353.6 966.6
Energy | Cost      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 1,745.0 1,756.4  
Energy | Accumulated Depletion      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net (406.8) (402.8)  
Energy | Impairment      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net (267.7)    
Advanced      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 167.7 170.9 129.8
Advanced | Cost      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 199.8 203.2  
Advanced | Accumulated Depletion      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net (32.1) (32.3)  
Exploration      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 52.6 53.7 $ 41.5
Exploration | Cost      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 64.7 66.2  
Exploration | Accumulated Depletion      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net $ (12.1) $ (12.5)