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Royalty, Stream and Working Interests - Disposal of Royalty Interest (Details)
$ in Millions, $ in Millions, $ in Millions
12 Months Ended
Mar. 30, 2024
USD ($)
Jan. 19, 2024
USD ($)
Feb. 22, 2023
USD ($)
Feb. 19, 2019
USD ($)
Dec. 31, 2023
USD ($)
Mar. 30, 2024
AUD ($)
Jun. 08, 2023
USD ($)
Feb. 22, 2023
CAD ($)
Feb. 19, 2019
CAD ($)
Acquisitions                  
Written off amount         $ 1,173.3        
Percentage of NSR     1.50% 2.00%          
Sale of net smelter royalty   $ 4.7              
Marathon Gold Corporation, Valentine Gold Project Acquisition                  
Acquisitions                  
Option to buy back of NSR (as a percent)     0.50%         0.50%  
Percentage of NSR     2.00%   3.00%        
Consideration paid for options to buy-back royalty     $ 7.0            
Purchase price       $ 13.7     $ 45.0   $ 18.0
Carrying value of smelter royalty interest subject to buyback provision     $ 3.3         $ 4.5  
Gain on sale of royalty interest         $ 3.7        
Fortuna Silver Mines                  
Acquisitions                  
Option to buy back of NSR (as a percent) 0.60%         0.60%      
Percentage of NSR 1.20%                
Consideration paid for options to buy-back royalty $ 6.5         $ 10