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Royalty, stream and working interests - Royalties, Streams and Working Interests (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Royalty, stream and working interests      
Royalty, stream and working interests, net $ 4,632.1 $ 4,797.8 $ 4,555.6
Royalty, stream and working interest, net depletable 3,327.3 3,743.8  
Royalty, stream and working interest, net non-depletable 1,304.8 1,054.0  
Cost      
Royalty, stream and working interests      
Royalty, stream and working interests, net 7,759.6 7,407.8  
Accumulated Depletion      
Royalty, stream and working interests      
Royalty, stream and working interests, net (2,869.4) (2,610.0)  
Impairment (charges) reversals      
Royalty, stream and working interests      
Royalty, stream and working interests, net (258.1)    
Mineral Royalties      
Royalty, stream and working interests      
Royalty, stream and working interests, net 406.9 415.6 450.1
Mineral Royalties | Cost      
Royalty, stream and working interests      
Royalty, stream and working interests, net 1,049.2 1,035.7  
Mineral Royalties | Accumulated Depletion      
Royalty, stream and working interests      
Royalty, stream and working interests, net (642.3) (620.1)  
Streams      
Royalty, stream and working interests      
Royalty, stream and working interests, net 2,653.6 2,804.0 2,967.6
Streams | Cost      
Royalty, stream and working interests      
Royalty, stream and working interests, net 4,346.6 4,346.3  
Streams | Accumulated Depletion      
Royalty, stream and working interests      
Royalty, stream and working interests, net (1,702.6) (1,542.3)  
Streams | Impairment (charges) reversals      
Royalty, stream and working interests      
Royalty, stream and working interests, net 9.6    
Energy      
Royalty, stream and working interests      
Royalty, stream and working interests, net 1,214.6 1,353.6 966.6
Energy | Cost      
Royalty, stream and working interests      
Royalty, stream and working interests, net 1,944.7 1,756.4  
Energy | Accumulated Depletion      
Royalty, stream and working interests      
Royalty, stream and working interests, net (462.4) (402.8)  
Energy | Impairment (charges) reversals      
Royalty, stream and working interests      
Royalty, stream and working interests, net (267.7)    
Advanced      
Royalty, stream and working interests      
Royalty, stream and working interests, net 294.0 170.9 129.8
Advanced | Cost      
Royalty, stream and working interests      
Royalty, stream and working interests, net 343.0 203.2  
Advanced | Accumulated Depletion      
Royalty, stream and working interests      
Royalty, stream and working interests, net (49.0) (32.3)  
Exploration      
Royalty, stream and working interests      
Royalty, stream and working interests, net 63.0 53.7 $ 41.5
Exploration | Cost      
Royalty, stream and working interests      
Royalty, stream and working interests, net 76.1 66.2  
Exploration | Accumulated Depletion      
Royalty, stream and working interests      
Royalty, stream and working interests, net $ (13.1) $ (12.5)