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Dispositions - Schedule of Disposals (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 02, 2024
Nov. 06, 2023
Sep. 22, 2023
Sep. 20, 2023
Dec. 31, 2024
Dec. 31, 2023
Disposal Group [Line Items]            
Cash proceeds         $ 306.6 $ 549.1
Net smelter return royalty           101.1
Net proceeds           650.2
Cash and cash equivalents           194.1
Other current assets           14.0
Mineral properties, plant and equipment           1,578.5
Other non-current assets           3.9
Other current liabilities           (39.0)
Provisions           (148.1)
Deferred tax liabilities           (419.3)
Long-term debt           (31.5)
Other long-term liabilities           (19.4)
Net carrying amount           1,133.2
Non-controlling interest           (489.7)
Net assets attributable to Pan American           643.5
Gain on disposal           $ 6.7
Working capital adjustments         $ 61.6  
La Arena            
Disposal Group [Line Items]            
Cash proceeds $ 306.6          
Net smelter return royalty 29.7          
Contingent consideration 36.8          
Net proceeds 373.1          
Cash and cash equivalents 16.2          
Trade and other receivables 29.6          
Inventories 134.2          
Mineral properties, plant and equipment 223.2          
Other non-current assets 0.1          
Accounts payable and accrued liabilities (55.1)          
Other current liabilities (15.6)          
Provisions (86.5)          
Other long-term liabilities (12.3)          
Net assets attributable to Pan American 233.8          
Add: Costs directly attributable to the disposal 1.9          
Gain on disposal $ 137.4          
MARA            
Disposal Group [Line Items]            
Cash proceeds       $ 475.0    
Net smelter return royalty       90.0    
Net proceeds       565.0    
Cash and cash equivalents       188.4    
Other current assets       9.1    
Mineral properties, plant and equipment       1,400.5    
Other non-current assets       3.1    
Other current liabilities       (27.0)    
Provisions       (133.2)    
Deferred tax liabilities       (380.4)    
Long-term debt       (31.5)    
Other long-term liabilities       (19.3)    
Net carrying amount       1,009.7    
Non-controlling interest       (444.7)    
Net assets attributable to Pan American       565.0    
Gain on disposal       $ 0.0    
Morococha            
Disposal Group [Line Items]            
Cash proceeds     $ 28.6      
Net smelter return royalty     0.0      
Net proceeds     28.6      
Cash and cash equivalents     5.6      
Other current assets     4.8      
Mineral properties, plant and equipment     35.8      
Other non-current assets     0.8      
Other current liabilities     (11.6)      
Provisions     (11.2)      
Deferred tax liabilities     (0.1)      
Long-term debt     0.0      
Other long-term liabilities     (0.1)      
Net carrying amount     24.0      
Non-controlling interest     (2.1)      
Net assets attributable to Pan American     21.9      
Gain on disposal     6.7      
Working capital adjustments     $ 3.6      
Agua de la Falda project            
Disposal Group [Line Items]            
Cash proceeds   $ 45.5        
Net smelter return royalty   11.1        
Net proceeds   56.6        
Cash and cash equivalents   0.1        
Other current assets   0.1        
Mineral properties, plant and equipment   142.2        
Other non-current assets   0.0        
Other current liabilities   (0.4)        
Provisions   (3.7)        
Deferred tax liabilities   (38.8)        
Long-term debt   0.0        
Other long-term liabilities   0.0        
Net carrying amount   99.5        
Non-controlling interest   (42.9)        
Net assets attributable to Pan American   56.6        
Gain on disposal   $ 0.0