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Inventories (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of inventories [Line Items]    
Total inventories $ 739.4 $ 497.9
Less: current portion of inventories (711.6) (471.6)
Non-current portion of inventories 27.8 26.3
Inventories, at net realisable value 170.0 135.8
Write downs (recoveries) (31.8) 97.7
Escobal    
Disclosure of inventories [Line Items]    
Non-current portion of inventories 20.5 19.0
Concentrate inventory    
Disclosure of inventories [Line Items]    
Total inventories 21.3 31.3
Stockpile ore    
Disclosure of inventories [Line Items]    
Total inventories 67.2 31.3
Non-current portion of inventories 0.7 0.9
Heap leach inventory and in process    
Disclosure of inventories [Line Items]    
Total inventories 338.6 258.8
Non-current portion of inventories 70.1 53.9
Doré and finished inventory    
Disclosure of inventories [Line Items]    
Total inventories 121.1 86.8
Materials and supplies    
Disclosure of inventories [Line Items]    
Total inventories $ 191.2 $ 89.7