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Finance Expense - Summary of Finance Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of transactions between related parties [line items]      
Interest expense – environmental rehabilitation $ (21.8) $ (11.8) $ (8.6)
Unwinding of discount rate on silicosis settlement costs (0.9) (1.0) (1.1)
Interest expense 22.7 22.5 24.1
Interest expense – borrowings 82.4 75.1 79.6
General borrowing costs capitalised 64.9 37.9 12.5
Total finance expense (62.9) (72.5) (100.9)
Borrowing costs 64.9 37.9 12.5
Interest expense 104.8 97.2 103.2
Non-cash interest expense $ 0.3 $ 0.4 $ 0.5