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Long-term Incentive Plan - Summary of Long-term Incentive Plan (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of long-term incentive plan [abstract]      
Opening balance $ 53.0 $ 56.6  
Charge to income statement 55.8 29.0 $ 28.5
Salares Norte project costs capitalised 2.3 1.7  
Payments (32.0) (32.4)  
Translation adjustment (0.2) (1.9)  
Balance at end of the year 78.9 53.0 $ 56.6
Current portion of long-term incentive plan (38.4) (30.6)  
Non-current portion of long-term incentive plan $ 40.5 $ 22.4  
Maturity term 3 years