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Royalty, stream and working interests - Royalties, Streams and Working Interests (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net $ 4,797.8 $ 4,555.6 $ 3,939.2
Royalty, stream and working interest, net depletable 3,743.8 2,233.0  
Royalty, stream and working interest, net non-depletable 1,054.0 2,322.6  
Cost      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 7,407.8 6,886.1  
Accumulated Depletion      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net (2,610.0) (2,254.5)  
Impairment      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net   (76.0)  
Mineral Royalties      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 415.6 450.1 486.1
Mineral Royalties | Cost      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 1,035.7 1,021.4  
Mineral Royalties | Accumulated Depletion      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net (620.1) (571.3)  
Streams      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 2,804.0 2,967.6 2,575.4
Streams | Cost      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 4,346.3 4,346.3  
Streams | Accumulated Depletion      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net (1,542.3) (1,303.3)  
Streams | Impairment      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net   (75.4)  
Energy      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 1,353.6 966.6 682.7
Energy | Cost      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 1,756.4 1,303.8  
Energy | Accumulated Depletion      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net (402.8) (337.2)  
Advanced      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 170.9 129.8 151.9
Advanced | Cost      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 203.2 159.9  
Advanced | Accumulated Depletion      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net (32.3) (30.1)  
Exploration      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 53.7 41.5 $ 43.1
Exploration | Cost      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 66.2 54.7  
Exploration | Accumulated Depletion      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net $ (12.5) (12.6)  
Exploration | Impairment      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net   $ (0.6)