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Provisions - Schedule of Provisions (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in other provisions [abstract]      
Environmental rehabilitation costs at beginning of the year $ 387.7 $ 430.9  
Silicosis settlement costs 5.1 10.5  
Other 1.4 1.9  
Total provisions 459.4 400.1  
Changes in estimates 53.9 (22.1)  
Changes in estimates - recognised in profit or loss 4.0 (8.9)  
Interest expense 21.8 11.8 $ 8.6
Payments (14.8) (10.8)  
Translation adjustment 0.3 (13.2)  
Environmental rehabilitation costs at end of the year 452.9 387.7 $ 430.9
Current portion of provisions (47.0) (18.5)  
Non-current portion of provisions 412.4 381.6  
Current portion of environmental rehabilitation costs (46.8) (17.2)  
Non-current portion of environmental rehabilitation costs 406.1 370.5  
Total gross closure cost estimates 598.1 564.8  
South Africa      
Reconciliation of changes in other provisions [abstract]      
Total gross closure cost estimates 44.0 47.2  
Ghana      
Reconciliation of changes in other provisions [abstract]      
Total gross closure cost estimates 107.5 101.0  
Australia      
Reconciliation of changes in other provisions [abstract]      
Total gross closure cost estimates 230.6 215.4  
Peru      
Reconciliation of changes in other provisions [abstract]      
Total gross closure cost estimates 168.9 148.4  
Chile      
Reconciliation of changes in other provisions [abstract]      
Total gross closure cost estimates $ 47.1 $ 52.8