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Long-term Incentive Plan - Summary of Long-term Incentive Plan (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of long-term incentive plan [abstract]      
Opening balance $ 56.6 $ 67.2  
Charge to income statement 29.0 28.5 $ 51.3
Salares Norte project costs capitalised 1.7 0.5  
Payments (32.4) (37.3)  
Translation adjustment (1.9) (2.3)  
Balance at end of the year 53.0 56.6 $ 67.2
Current portion of long-term incentive plan (30.6) (28.4)  
Non-current portion of long-term incentive plan $ 22.4 $ 28.2  
Maturity term 3 years