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Finance Expense - Summary of Finance Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of finance expense [abstract]      
Interest expense - environmental rehabilitation $ (11.7) $ (11.7) $ (12.1)
Unwinding of discount rate on silicosis settlement costs (1.3) (2.0) (0.9)
Interest expense - lease liabilities (2018: finance lease liabilities) (18.6) (0.2) 0.0
Interest expense - borrowings (114.0) (91.6) (91.2)
Borrowing costs capitalised [1] 43.4 17.5 22.9
Total finance expense $ (102.2) $ (88.0) $ (81.3)
[1] Borrowing costs capitalised of US$43.4 million comprise borrowing costs relating to general borrowings of US$31.0 million and specific borrowings of US$12.4 million. The specific borrowings of US$12.4 million relate to the Gruyere project and are included in additions to property, plant and equipment of US$612.5 million (refer note 13).