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Revenue (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revenue    
Revenue $ 653.2 $ 675.0
Revenue-based royalties    
Revenue    
Revenue 197.9 155.8
Streams    
Revenue    
Revenue 371.7 443.3
Profit-based royalties    
Revenue    
Revenue 44.0 37.0
Other    
Revenue    
Revenue 39.6 38.9
Gold    
Revenue    
Revenue 435.8 467.2
Provisional price adjustment 1.3  
Silver    
Revenue    
Revenue 78.2 98.1
Platinum-group metals    
Revenue    
Revenue 39.1 44.5
Provisional price adjustment 2.4  
Other mining commodities    
Revenue    
Revenue 14.0 18.2
Energy    
Revenue    
Revenue 86.1 47.0
Latin American    
Revenue    
Revenue 268.3 326.0
United States    
Revenue    
Revenue 137.2 100.2
Canada    
Revenue    
Revenue 122.6 125.5
Rest of World    
Revenue    
Revenue $ 125.1 $ 123.3