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Finance Expense - Summary of Finance Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of transactions between related parties [line items]      
Interest expense – environmental rehabilitation $ (11.8) $ (8.6) $ (10.7)
Unwinding of discount rate on silicosis settlement costs (1.0) (1.1) (1.5)
Interest expense 22.5 24.1 22.4
Interest expense – borrowings 75.1 79.6 105.3
General borrowing costs capitalised 37.9 12.5 13.2
Total finance expense (72.5) (100.9) (126.7)
Borrowing costs 37.9 12.5 13.2
Interest expense 97.2 103.2 127.2
Non-cash interest expense $ 0.4 $ 0.5 $ 0.5