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Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue $ 173.1 $ 172.7
Revenue-based royalties    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 45.3 34.1
Streams    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 103.7 116.3
Profit-based royalties    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 11.8 8.9
Other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 12.3 13.4
Gold    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 118.3 122.9
Provisional price adjustment 0.3  
Silver    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 23.5 24.4
Platinum-group metals    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 9.3 10.7
Provisional price adjustment 0.1  
Other minerals    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 3.0 3.8
Oil and gas    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 19.0 10.9
Latin American    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 77.1 86.7
United States    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 30.6 24.0
Canada    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 31.8 29.2
Rest of World    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue $ 33.6 $ 32.8