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Royalty, stream and working interests - Rollforward (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Royalty, stream and working interests    
Balance at beginning of period $ 5,149.3 $ 4,632.1
Additions 11.0 753.0
Impairment (charges) and reversals   68.0
Depletion (143.2) (297.4)
Impact of foreign exchange (18.9) (6.4)
Balance at end of period 4,998.2 5,149.3
Mining Royalties    
Royalty, stream and working interests    
Balance at beginning of period 903.0 406.9
Additions 6.3 540.0
Transfers   6.3
Depletion (20.2) (42.7)
Impact of foreign exchange (10.7) (7.5)
Balance at end of period 878.4 903.0
Streams    
Royalty, stream and working interests    
Balance at beginning of period 2,623.0 2,653.6
Additions   165.6
Depletion (90.5) (196.2)
Balance at end of period 2,532.5 2,623.0
Energy    
Royalty, stream and working interests    
Balance at beginning of period 1,258.3 1,214.6
Additions 3.6 24.7
Impairment (charges) and reversals   75.5
Depletion (32.3) (57.9)
Impact of foreign exchange (5.6) 1.4
Balance at end of period 1,224.0 1,258.3
Advanced    
Royalty, stream and working interests    
Balance at beginning of period 308.8 294.0
Additions   22.7
Impairment (charges) and reversals   (7.5)
Depletion (0.2) (0.6)
Impact of foreign exchange (1.8) 0.2
Balance at end of period 306.8 308.8
Exploration    
Royalty, stream and working interests    
Balance at beginning of period 56.2 63.0
Additions 1.1  
Transfers   (6.3)
Impact of foreign exchange (0.8) (0.5)
Balance at end of period $ 56.5 $ 56.2