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Accounting Policies - Additional Information (Detail) R in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 ZAR (R) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 ZAR (R) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 ZAR (R) | Dec. 31, 2015 USD ($)
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |
Carrying amount of property, plant and equipment | $ 4,259.2 |  |  | $ 4,892.9 |  |  |  |  |  |
Carrying value of goodwill | 0.0 |  |  | 76.6 |  |  | $ 317.8 |  |  |
Impairment loss on goodwill | 71.7 |  |  | 277.8 |  |  | 0.0 |  |  |
Gold-in-process and stockpiles | 325.0 |  |  | 305.4 |  |  |  |  |  |
Provision for environmental rehabilitation costs | 289.6 |  |  | 281.5 |  |  | 283.1 |  |  |
Silicosis settlement costs | 25.1 |  |  | 31.9 |  |  |  |  |  |
Deferred taxation liability | 454.9 |  |  | 453.9 |  |  |  |  |  |
Deferred taxation asset | 269.5 |  |  | 72.0 |  |  |  |  |  |
Taxation payable | 5.2 |  |  | 77.5 |  |  | 107.9 |  |  | $ 59.3
Share-based payments | 37.5 |  |  | 26.8 |  |  | 14.0 |  |  |
Derivative financial assets | 9.3 |  |  | 5.5 |  |  |  |  |  |
Derivative financial liabilities | 22.6 |  |  | 3.3 |  |  |  |  |  |
Asanko redeemable preference shares | $ 132.9 |  |  | 0.0 |  |  |  |  |  |
Dividends withholding tax percentage | 20.00% |  | 20.00% |  |  |  |  |  |  |
South Deep Mine [member] |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |
Impairment loss | $ 481.5 |  | R 6,470,900.0 | 277.8 |  | R 3,495,000.0 | 0.0 |  | R 0.0 |
South Deep Mine [member] | Goodwill [member] |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |
Impairment loss on goodwill | 71.7 | [1] | 963.9 | 277.8 | [1] | 3,495.0 | 0.0 | [1] |  |
South Deep Mine [member] | Other impaired assets [member] |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |
Impairment loss | $ 409.8 | [1] | R 5,507.0 | $ 0.0 | [1] | R 0.0 | $ 0.0 | [1] |  |
Rand [member] |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |
Closing exchange rate | 14.63 |  |  | 12.58 |  |  |  |  |  |
Average exchange rate | 13.20 |  | 13.20 | 13.33 |  | 13.33 | 14.70 |  | 14.70 |
US Dollars [member] |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |
Closing exchange rate | 0.70 |  |  | 0.77 |  |  |  |  |  |
Average exchange rate | 0.75 |  | 0.75 | 0.77 |  | 0.77 | 0.75 |  | 0.75 |
Trade And Other Receivable [member] |  |  |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |  |  |
Derivative financial assets | $ 8.3 |  |  | $ 25.0 |  |  |  |  |  |
[1] | For the year ended 31 December 2018, the Group recognised an impairment of R6,470.9 million (US$481.5 million) (2017: R3,495.0 billion (US$277.8 million) and 2016: Rnil (US$nil)) in respect of the South Deep cash-generating unit due to the deferral of production.

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