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Royalty, stream and working interests - Royalties, Streams and Working Interests (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Royalty, stream and working interests      
Royalty, stream and working interests, net $ 5,149.3 $ 4,632.1 $ 4,797.8
Royalty, stream and working interest, net depletable 4,107.5 3,327.3  
Royalty, stream and working interest, net non-depletable 1,041.8 1,304.8  
Impairment (charges) and reversals (68.0) 258.1  
Cost      
Royalty, stream and working interests      
Royalty, stream and working interests, net 8,507.7 7,759.6  
Accumulated Depletion      
Royalty, stream and working interests      
Royalty, stream and working interests, net (3,426.4) (2,869.4)  
Impairment (charges) reversals      
Royalty, stream and working interests      
Royalty, stream and working interests, net 68.0 (258.1)  
Impairment (charges) and reversals (68.0) 262.1  
Impairment (charges) reversals | Weyburn      
Royalty, stream and working interests      
Impairment (charges) and reversals (75.5) 60.5  
Impairment (charges) reversals | SCOOP/STACK      
Royalty, stream and working interests      
Impairment (charges) and reversals   207.2  
Impairment (charges) reversals | Mine Waste Solutions      
Royalty, stream and working interests      
Impairment (charges) and reversals   (9.6)  
Impairment (charges) reversals | Agi Dagi      
Royalty, stream and working interests      
Impairment (charges) and reversals 7.5    
Impairment (charges) reversals | Oil well equipment      
Royalty, stream and working interests      
Impairment (charges) and reversals   4.0  
Mining Royalties      
Royalty, stream and working interests      
Royalty, stream and working interests, net 903.0 406.9 415.6
Mining Royalties | Cost      
Royalty, stream and working interests      
Royalty, stream and working interests, net 1,590.2 1,049.2  
Mining Royalties | Accumulated Depletion      
Royalty, stream and working interests      
Royalty, stream and working interests, net (687.2) (642.3)  
Streams      
Royalty, stream and working interests      
Royalty, stream and working interests, net 2,623.0 2,653.6 2,804.0
Impairment (charges) and reversals   (9.6)  
Streams | Mine Waste Solutions      
Royalty, stream and working interests      
Royalty, stream and working interests, net   77.2  
Streams | Cost      
Royalty, stream and working interests      
Royalty, stream and working interests, net 4,511.9 4,346.6  
Streams | Accumulated Depletion      
Royalty, stream and working interests      
Royalty, stream and working interests, net (1,888.9) (1,702.6)  
Streams | Impairment (charges) reversals      
Royalty, stream and working interests      
Royalty, stream and working interests, net   9.6  
Energy      
Royalty, stream and working interests      
Royalty, stream and working interests, net 1,258.3 1,214.6 1,353.6
Impairment (charges) and reversals (75.5) 267.7  
Energy | Cost      
Royalty, stream and working interests      
Royalty, stream and working interests, net 1,972.6 1,944.7  
Energy | Accumulated Depletion      
Royalty, stream and working interests      
Royalty, stream and working interests, net (789.8) (462.4)  
Energy | Impairment (charges) reversals      
Royalty, stream and working interests      
Royalty, stream and working interests, net 75.5 (267.7)  
Advanced      
Royalty, stream and working interests      
Royalty, stream and working interests, net 308.8 294.0 170.9
Impairment (charges) and reversals 7.5    
Advanced | Cost      
Royalty, stream and working interests      
Royalty, stream and working interests, net 365.9 343.0  
Advanced | Accumulated Depletion      
Royalty, stream and working interests      
Royalty, stream and working interests, net (49.6) (49.0)  
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 56.2 63.0 $ 53.7
Exploration | Cost      
Royalty, stream and working interests      
Royalty, stream and working interests, net 67.1 76.1  
Exploration | Accumulated Depletion      
Royalty, stream and working interests      
Royalty, stream and working interests, net $ (10.9) $ (13.1)