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Royalty, Stream and Working Interests, Net - Royalties, Streams and Working Interests (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net $ 3,939.2 $ 3,668.3 $ 3,257.5
Cost      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 5,989.2 5,420.3  
Accumulated Depletion      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net (2,050.0) (1,684.5)  
Impairment      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net   (67.5)  
Mineral Royalties      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 486.1 488.0 538.2
Mineral Royalties | Cost      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 1,017.0 963.0  
Mineral Royalties | Accumulated Depletion      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net (530.9) (475.0)  
Streams      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 2,575.4 2,502.2 2,122.3
Streams | Cost      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 3,715.9 3,450.0  
Streams | Accumulated Depletion      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net (1,140.5) (880.4)  
Streams | Impairment      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net   (67.4)  
Oil And Gas      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 682.7 448.9 356.3
Royalty, stream and working interest, net depletable 453.7 345.8  
Royalty, stream and working interest, net non-depletable 229.0 103.1  
Oil And Gas | Cost      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 1,009.5 732.4  
Oil And Gas | Accumulated Depletion      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net (326.8) (283.5)  
Advanced      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 151.9 188.8 200.4
Advanced | Cost      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 188.1 222.9  
Advanced | Accumulated Depletion      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net (36.2) (34.1)  
Exploration      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 43.1 40.4 $ 40.3
Exploration | Cost      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net 58.7 52.0  
Exploration | Accumulated Depletion      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net $ (15.6) (11.5)  
Exploration | Impairment      
Royalty, Stream and Working Interests, Net      
Royalty, stream and working interests, net   $ (0.1)