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Royalty, Stream and Working Interests - Royalties, Streams and Working Interests (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Royalty, stream and working interests      
Royalty, stream and working interests, net $ 4,927.5 $ 5,149.3 $ 4,632.1
Royalty, stream and working interest, net depletable 3,980.2 4,107.5  
Royalty, stream and working interest, net non-depletable 947.3 1,041.8  
Impairment (charges) and reversals 0.0 (68.0)  
Cost      
Royalty, stream and working interests      
Royalty, stream and working interests, net 8,531.1 8,507.7  
Accumulated Depletion      
Royalty, stream and working interests      
Royalty, stream and working interests, net (3,603.6) (3,426.4)  
Impairment (charges) reversals      
Royalty, stream and working interests      
Royalty, stream and working interests, net   68.0  
Impairment (charges) and reversals   (68.0)  
Impairment (charges) reversals | Weyburn      
Royalty, stream and working interests      
Impairment (charges) and reversals   (75.5)  
Impairment (charges) reversals | Agi Dagi      
Royalty, stream and working interests      
Impairment (charges) and reversals   7.5  
Mining Royalties      
Royalty, stream and working interests      
Royalty, stream and working interests, net 865.8 903.0 406.9
Mining Royalties | Cost      
Royalty, stream and working interests      
Royalty, stream and working interests, net 1,582.7 1,590.2  
Mining Royalties | Accumulated Depletion      
Royalty, stream and working interests      
Royalty, stream and working interests, net (716.9) (687.2)  
Streams      
Royalty, stream and working interests      
Royalty, stream and working interests, net 2,447.4 2,623.0 2,653.6
Streams | Cost      
Royalty, stream and working interests      
Royalty, stream and working interests, net 4,513.1 4,511.9  
Streams | Accumulated Depletion      
Royalty, stream and working interests      
Royalty, stream and working interests, net (2,065.7) (1,888.9)  
Energy      
Royalty, stream and working interests      
Royalty, stream and working interests, net 1,181.5 1,258.3 1,214.6
Impairment (charges) and reversals   (75.5)  
Energy | Cost      
Royalty, stream and working interests      
Royalty, stream and working interests, net 1,937.0 1,972.6  
Energy | Accumulated Depletion      
Royalty, stream and working interests      
Royalty, stream and working interests, net (755.5) (789.8)  
Energy | Impairment (charges) reversals      
Royalty, stream and working interests      
Royalty, stream and working interests, net   75.5  
Advanced      
Royalty, stream and working interests      
Royalty, stream and working interests, net 371.0 308.8 294.0
Impairment (charges) and reversals   7.5  
Advanced | Cost      
Royalty, stream and working interests      
Royalty, stream and working interests, net 426.6 365.9  
Advanced | Accumulated Depletion      
Royalty, stream and working interests      
Royalty, stream and working interests, net (55.6) (49.6)  
Advanced | Impairment (charges) reversals      
Royalty, stream and working interests      
Royalty, stream and working interests, net   (7.5)  
Exploration      
Royalty, stream and working interests      
Royalty, stream and working interests, net 61.8 56.2 $ 63.0
Exploration | Cost      
Royalty, stream and working interests      
Royalty, stream and working interests, net 71.7 67.1  
Exploration | Accumulated Depletion      
Royalty, stream and working interests      
Royalty, stream and working interests, net $ (9.9) $ (10.9)