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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Revenue          
Revenue $ 195.4 $ 170.5 $ 435.9 $ 350.3 $ 350.3
Revenue-based royalties          
Revenue          
Revenue 65.1 56.4 133.5   112.8
Streams          
Revenue          
Revenue 112.6 88.1 263.4   192.8
Profit-based royalties          
Revenue          
Revenue 14.1 17.3 30.3   26.9
Other          
Revenue          
Revenue 3.6 8.7 8.7   17.8
Mining          
Revenue          
Revenue 180.8 142.9 394.8   301.9
Gold          
Revenue          
Revenue 136.6 105.9 303.6   219.9
Provisional price adjustment 0.0 0.3 0.2 0.0  
Silver          
Revenue          
Revenue 20.2 16.6 42.3   36.6
Platinum-group metals          
Revenue          
Revenue 21.4 14.7 44.0   33.8
Provisional price adjustment 0.1 0.8 3.2 $ 3.4  
Other mining commodities          
Revenue          
Revenue 2.6 5.7 4.9   11.6
Energy          
Revenue          
Revenue 14.6 27.6 41.1   48.4
Latin American          
Revenue          
Revenue 80.4 60.9 198.0   135.9
United States          
Revenue          
Revenue 44.7 36.0 89.7   68.9
Canada          
Revenue          
Revenue 35.7 39.7 82.1   78.5
Rest of World          
Revenue          
Revenue $ 34.6 $ 33.9 $ 66.1   $ 67.0