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Inventories (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of inventories [Line Items]    
Total inventories $ 635.1 $ 739.4
Less: current portion of inventories (605.7) (711.6)
Non-current portion of inventories 29.4 27.8
Inventories, at net realisable value 76.2 170.0
Write downs, including net realizable value adjustments 71.3  
Depreciation and amortization from net realizable value adjustments 50.7  
Write downs (recoveries) 20.6 (31.8)
Escobal    
Disclosure of inventories [Line Items]    
Non-current portion of inventories 22.1 20.5
Concentrate inventory    
Disclosure of inventories [Line Items]    
Total inventories 31.8 21.3
Stockpile ore    
Disclosure of inventories [Line Items]    
Total inventories 67.8 67.2
Non-current portion of inventories 0.7
Heap leach inventory and in process    
Disclosure of inventories [Line Items]    
Total inventories 223.5 338.6
Non-current portion of inventories 4.1 70.1
Doré and finished inventory    
Disclosure of inventories [Line Items]    
Total inventories 131.1 121.1
Materials and supplies    
Disclosure of inventories [Line Items]    
Total inventories $ 180.9 $ 191.2