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Royalty, Stream and Working Interests - Rollforward (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Royalty, stream and working interests    
Balance at beginning of period $ 4,027.1 $ 4,927.5
Additions 165.5 519.6
Disposal (10.8) (3.3)
Impairment losses   (1,173.3)
Depletion (109.9) (270.7)
Impact of foreign exchange (40.8) 27.3
Balance at end of period 4,031.1 4,027.1
Mining Royalties    
Royalty, stream and working interests    
Balance at beginning of period 948.7 865.8
Additions   37.7
Disposal (10.8)  
Transfers 44.8 71.3
Depletion (20.5) (40.2)
Impact of foreign exchange (20.0) 14.1
Balance at end of period 942.2 948.7
Streams    
Royalty, stream and working interests    
Balance at beginning of period 1,359.0 2,447.4
Additions 10.8 250.2
Impairment losses   (1,169.2)
Depletion (59.0) (169.4)
Balance at end of period 1,310.8 1,359.0
Energy    
Royalty, stream and working interests    
Balance at beginning of period 1,146.4 1,181.5
Additions 132.5 22.2
Impairment losses   (4.1)
Depletion (30.4) (60.8)
Impact of foreign exchange (10.5) 7.6
Balance at end of period 1,238.0 1,146.4
Advanced    
Royalty, stream and working interests    
Balance at beginning of period 396.0 371.0
Additions 8.9 99.3
Disposal   (3.3)
Transfers (36.5) (75.6)
Depletion   (0.3)
Impact of foreign exchange (8.9) 4.9
Balance at end of period 359.5 396.0
Exploration    
Royalty, stream and working interests    
Balance at beginning of period 177.0 61.8
Additions 13.3 110.2
Transfers (8.3) 4.3
Impact of foreign exchange (1.4) 0.7
Balance at end of period $ 180.6 $ 177.0