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Segment Reporting - Geographical (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Geographical    
Revenue $ 675.0 $ 610.2
Royalty, stream and working interests 3,939.2 3,668.3
Investments 203.1 147.4
Oil and gas well equipment 12.7 14.0
United States    
Geographical    
Revenue 100.2 92.4
Royalty, stream and working interests 622.5 502.0
Canada    
Geographical    
Revenue 125.5 116.9
Royalty, stream and working interests 666.7 610.5
Investments 203.1 147.4
Oil and gas well equipment 12.7 14.0
Peru    
Geographical    
Revenue 153.1 167.5
Royalty, stream and working interests 953.2 1,021.7
Chile    
Geographical    
Revenue 105.2 88.4
Royalty, stream and working interests 533.4 586.1
Panama    
Geographical    
Royalty, stream and working interests 734.4 468.9
Other Latin America other than Peru and Chile    
Geographical    
Revenue 67.7 47.8
Other Latin America other than Peru, Chile and Panama    
Geographical    
Royalty, stream and working interests 59.0 64.3
Rest of World    
Geographical    
Revenue 123.3 97.2
Royalty, stream and working interests $ 370.0 $ 414.8