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Segment Reporting - Geographical (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Geographical    
Revenue $ 653.2 $ 675.0
Royalty, stream and working interests 4,555.6 3,939.2
Investments 169.7 203.1
Oil and gas well equipment 10.2 12.7
Peru    
Geographical    
Revenue 148.6 153.1
Royalty, stream and working interests 886.2 953.2
Chile    
Geographical    
Revenue 70.5 105.2
Royalty, stream and working interests 504.0 533.4
Panama    
Geographical    
Royalty, stream and working interests 1,364.9 734.4
Other Latin America other than Peru and Chile    
Geographical    
Revenue 49.2 67.7
Other Latin America other than Peru, Chile and Panama    
Geographical    
Royalty, stream and working interests 52.6 59.0
United States    
Geographical    
Revenue 137.2 100.2
Royalty, stream and working interests 931.1 622.5
Canada    
Geographical    
Revenue 122.6 125.5
Royalty, stream and working interests 503.9 666.7
Investments 169.7 203.1
Oil and gas well equipment 10.2 12.7
Rest of World    
Geographical    
Revenue 125.1 123.3
Royalty, stream and working interests $ 312.9 $ 370.0