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Accounting Policies - Additional Information (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |
Carrying amount of property, plant and equipment | $ 4,892.9 | $ 4,524.6 | [1] | $ 4,295.6 | [1] |
Carrying value of goodwill | 76.6 | 317.8 | [1] | 295.3 |  |
Impairment loss | 277.8 | 0.0 |  | 0.0 |  |
Gold-in-process and stockpiles | 305.4 | 234.3 |  |  |  |
Provision for environmental rehabilitation costs | 281.5 | 283.1 |  | 275.4 |  |
Silicosis settlement costs | 31.9 | 0.0 |  |  |  |
Deferred taxation liability | 453.9 | 458.6 | [1] | 482.2 | [1] |
Deferred taxation asset | 72.0 | 48.7 | [1] | 54.1 |  |
Taxation payable | 77.5 | 107.9 | [1] | 59.3 |  | $ 37.8
Share-based payments | 26.8 | $ 14.0 | [1] | $ 10.7 | [1] |
Increase in amortisation | $ 5.7 |  |  |  |  |
Dividends withholding tax percentage | 20.00% |  |  |  |  |
Rand [member] |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |
Closing exchange rate | 12.58 | 14.03 |  | 15.10 |  |
Average exchange rate | 13.33 | 14.70 |  | 12.68 |  |
US Dollars [member] |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |
Closing exchange rate | 0.77 | 0.72 |  | 0.73 |  |
Average exchange rate | 0.77 | 0.75 |  | 0.75 |  |
Trade And Other Receivable [Member] |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |
Derivative financial assets | $ 25.0 | $ 0.0 |  |  |  |
Trade and Other Payable [Member] |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |
Derivative financial liabilities | $ 3.3 | $ 0.0 |  |  |  |
[1] | As Restated - Refer note 40 for further details.

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