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Long-term Incentive Plan - Summary of Long-term Incentive Plan (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of long-term incentive plan [abstract]      
Opening balance $ 67.2 $ 11.5  
Charge to income statement 28.5 51.3 $ 9.1
Salares Norte project costs capitalised 0.5 0.6  
Payments (37.3) 0.0  
Translation adjustment (2.3) 3.8  
Balance at end of the year 56.6 67.2 $ 11.5
Current portion of long-term incentive plan (28.4) (33.8)  
Non-current portion of long-term incentive plan $ 28.2 $ 33.4  
Maturity term 3 years