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Exploration Expense - Summary of exploration expenses (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of geographical areas [line items]      
Total exploration expense $ (76.2) $ (81.0) $ (60.6)
Australia      
Disclosure of geographical areas [line items]      
Total exploration expense (33.4) (33.6) (21.3)
Ghana      
Disclosure of geographical areas [line items]      
Total exploration expense (9.0) (12.1) (9.6)
Peru      
Disclosure of geographical areas [line items]      
Total exploration expense (3.9) (2.8) (1.6)
Chile      
Disclosure of geographical areas [line items]      
Total exploration expense (29.3) (32.3) (27.2)
Other      
Disclosure of geographical areas [line items]      
Total exploration expense $ (0.6) $ (0.2) $ (0.9)