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Finance Expense - Summary of Finance Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of finance expense [abstract]      
Interest expense - environmental rehabilitation $ (10.7) $ (11.7) $ (11.7)
Unwinding of discount rate on silicosis settlement costs (1.5) (1.3) (2.0)
Interest expense - lease liability (2018: finance lease liabilities) (22.4) (18.6) (0.2)
Interest expense - borrowings (105.3) (114.0) (91.6)
Borrowing costs capitalised [1] 13.2 43.4 17.5
Total finance expense $ (126.7) $ (102.2) $ (88.0)
[1] Borrowing costs capitalised of US$13.2 million (2019: US$43.4 million) comprise borrowing costs relating to general borrowings of US$13.2 million (2019: US$31.0 million) and specific borrowings of US$nil (2019: US$12.4 million). The specific borrowings of US$nil (2019: US$12.4 million) relate to the Gruyere project and are included in additions to property, plant and equipment of US$nil (2019: US$612.5 million) (refer note 14).