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Exploration Expense - Summary of exploration expenses (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of geographical areas [line items]      
Total exploration expense $ (81.0) $ (60.6) $ (49.7)
Australia      
Disclosure of geographical areas [line items]      
Total exploration expense (33.6) (21.3) (16.9)
Ghana      
Disclosure of geographical areas [line items]      
Total exploration expense (12.1) (9.6) 0.0
Peru      
Disclosure of geographical areas [line items]      
Total exploration expense (2.8) (1.6) (1.4)
Chile      
Disclosure of geographical areas [line items]      
Total exploration expense (32.3) (27.2) (30.1)
Other      
Disclosure of geographical areas [line items]      
Total exploration expense $ (0.2) $ (0.9) $ (1.3)