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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue        
Revenue $ 161.3 $ 163.6 $ 334.4 $ 336.3
Revenue-based royalties        
Revenue        
Revenue 50.5 38.3 98.9 76.7
Streams        
Revenue        
Revenue 90.7 105.7 194.4 222.0
Profit-based royalties        
Revenue        
Revenue 11.9 10.1 23.7 19.0
Other        
Revenue        
Revenue 8.2 9.5 17.4 18.6
Gold        
Revenue        
Revenue 108.6 116.5 226.9 239.4
Provisional price adjustment 0.2   0.5  
Silver        
Revenue        
Revenue 18.1 22.8 41.6 47.2
Platinum-group metals        
Revenue        
Revenue 9.6 11.0 18.9 21.7
Provisional price adjustment 0.1   0.6  
Other mining commodities        
Revenue        
Revenue 2.3 3.7 5.3 7.5
Oil and gas        
Revenue        
Revenue 22.7 9.6 41.7 20.5
Latin American        
Revenue        
Revenue 63.9 76.1 141.0 162.8
United States        
Revenue        
Revenue 35.6 25.9 66.2 50.4
Canada        
Revenue        
Revenue 30.9 32.6 62.7 61.3
Rest of World        
Revenue        
Revenue $ 30.9 $ 29.0 $ 64.5 $ 61.8