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Royalty, Stream and Working Interests - Royalties, Streams and Working Interests (Details)
$ in Millions
12 Months Ended
Feb. 22, 2023
CAD ($)
Feb. 21, 2021
Feb. 21, 2019
Feb. 19, 2019
USD ($)
Dec. 31, 2023
USD ($)
Jun. 08, 2023
USD ($)
Feb. 23, 2023
USD ($)
Feb. 22, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 30, 2022
USD ($)
Dec. 30, 2022
CAD ($)
Apr. 14, 2022
USD ($)
Dec. 31, 2021
USD ($)
Feb. 19, 2019
CAD ($)
Royalty, stream and working interests                            
Royalty, stream and working interests, net         $ 4,027,100,000       $ 4,927,500,000       $ 5,149,300,000  
Royalty, stream and working interest, net depletable         2,990,900,000       3,980,200,000          
Royalty, stream and working interest, net non-depletable         1,036,200,000       947,300,000          
Impairment (charges) and reversals         1,173,300,000                  
Option to buy back of NSR (as a percent)               0.50%            
Percentage of NSR 1.50% 2.00% 2.00% 2.00%                    
Proceeds from sale of interest $ 18.0                          
Purchase of royalty             $ 7,000,000.0 $ 13,700,000   $ 1,100,000 $ 1.5 $ 37,400,000    
Gain on sale of royalty interest         3,700,000                  
Recoverable amount of asset         $ 0                  
Marathon Gold Corporation, Valentine Gold Project Acquisition                            
Royalty, stream and working interests                            
Option to buy back of NSR (as a percent)               0.50%            
Percentage of NSR 2.00%       3.00%                  
Purchase of royalty       $ 13,700,000   $ 45,000,000.0               $ 18.0
Gain on sale of royalty interest         $ 3,700,000                  
Cost                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         9,088,500,000       8,531,100,000          
Accumulated Depletion                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         (3,888,100,000)       (3,603,600,000)          
Impairment (losses) reversals                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         (1,173,300,000)                  
Mining Royalties                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         948,700,000       865,800,000       903,000,000.0  
Mining Royalties | Cost                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         1,709,700,000       1,582,700,000          
Mining Royalties | Accumulated Depletion                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         (761,000,000.0)       (716,900,000)          
Streams                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         1,359,000,000.0       2,447,400,000       2,623,000,000.0  
Impairment (charges) and reversals         1,169,200,000                  
Streams | Cost                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         4,763,600,000       4,513,100,000          
Streams | Accumulated Depletion                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         (2,235,400,000)       (2,065,700,000)          
Streams | Impairment (losses) reversals                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         (1,169,200,000)                  
Energy                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         1,146,400,000       1,181,500,000       1,258,300,000  
Impairment (charges) and reversals         4,100,000                  
Energy | Cost                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         1,976,000,000.0       1,937,000,000.0          
Energy | Accumulated Depletion                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         (825,500,000)       (755,500,000)          
Energy | Impairment (losses) reversals                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         (4,100,000)                  
Advanced                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         396,000,000.0       371,000,000.0       308,800,000  
Advanced | Cost                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         444,500,000       426,600,000          
Advanced | Accumulated Depletion                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         (48,500,000)       (55,600,000)          
Exploration                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         177,000,000.0       61,800,000       $ 56,200,000  
Exploration | Cost                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         194,700,000       71,700,000          
Exploration | Accumulated Depletion                            
Royalty, stream and working interests                            
Royalty, stream and working interests, net         $ (17,700,000)       $ (9,900,000)