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Accounting Policies - Additional Information (Detail) $ in Millions, R in Billions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 ZAR (R) | Dec. 31, 2019 ZAR (R) | Dec. 31, 2018 ZAR (R) | Dec. 31, 2017 USD ($)
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |
Carrying amount of property, plant and equipment |  | $ 4,771.2 | $ 4,657.1 |  |  |  |  |
Impairment loss |  | 11.7 |  |  |  |  |  |
Impairment loss on goodwill |  | 0.0 | 0.0 | $ 71.7 |  |  |  |
Gold-in-process and stockpiles |  | 450.2 | 375.1 |  |  |  |  |
Provision for environmental rehabilitation costs |  | 381.5 | 370.3 | 289.6 |  |  |  |
Current provision for environmental rehabilitation costs |  | 19.6 | 0.0 |  |  |  |  |
Non-current portion of environmental rehabilitation costs |  | 361.9 | 370.3 |  |  |  |  |
Charge to income statement |  | 51.3 | 9.1 | 1.1 |  |  |  |
Long-term incentive plan provision |  | 67.2 | 11.5 |  |  |  |  |
Current portion of long-term incentive plan |  | 33.8 | 0.0 |  |  |  |  |
Non-current portion of long-term incentive plan |  | 33.4 | 11.5 |  |  |  |  |
Silicosis settlement costs |  | 18.3 | 21.2 |  |  |  |  |
Silicosis settlement costs current |  | 4.0 | 4.6 |  |  |  |  |
Silicosis settlement costs noncurrent |  | 14.3 | 16.6 |  |  |  |  |
Deferred taxation liability |  | 499.9 | 433.6 |  |  |  |  |
Deferred taxation asset |  | 240.0 | 265.5 |  |  |  |  |
Taxation payable |  | 121.3 | 24.8 | 0.9 |  |  |  | $ 46.7
Share-based payments |  | 14.5 | 20.5 | 37.5 |  |  |  |
Derivative financial assets |  | 12.9 | 11.7 |  |  |  |  |
Derivative financial liabilities |  | 21.8 | 127.6 |  |  |  |  |
Asanko redeemable preference shares |  | $ 92.6 | 95.5 |  |  |  |  |
Dividends withholding tax percentage |  | 20.00% |  |  |  |  |  |
Equity accounted investees |  | $ 233.3 | 172.0 |  |  |  |  |
Derivative financial assets |  | 81.9 | 1.1 |  |  |  |  |
Non-current derivative financial assets |  | 31.4 | 0.0 |  |  |  |  |
Derivative financial liabilities |  | 21.8 | 127.6 |  |  |  |  |
Non-current derivative financial liabilities |  | 7.3 | 0.0 |  |  |  |  |
South Deep Mine [member] |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |
Goodwill carrying value |  | 1,400.0 | 1,500.0 | 1,400.0 | R 21.1 | R 21.1 | R 21.2 |
Impairment loss | [1] | 0.0 | 0.0 | 409.8 |  |  |  |
South Deep Mine [member] | Goodwill [member] |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |
Impairment loss on goodwill | [1] | $ 0.0 | $ 0.0 | 71.7 |  |  |  |
South Deep Mine [member] | Other impaired assets [member] |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |
Impairment loss |  |  |  | $ 481.5 |  |  |  |
Rand [member] |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |
Closing exchange rate |  | 14.69 | 14.00 | 14.63 | 14.69 | 14.00 | 14.63 |
Average exchange rate |  | 16.38 | 14.46 | 13.20 |  |  |  |
US Dollars [member] |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |
Closing exchange rate |  | 0.77 | 0.70 | 0.70 | 0.77 | 0.70 | 0.70 |
Average exchange rate |  | 0.69 | 0.70 | 0.75 |  |  |  |
Trade And Other Payable [Member] |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |
Derivative financial liabilities |  | $ 29.1 | $ 127.6 |  |  |  |  |
Derivative financial assets |  | 81.9 | 1.1 |  |  |  |  |
Non-current derivative financial assets |  | 31.4 | 0.0 |  |  |  |  |
Derivative financial liabilities |  | 21.8 | 127.6 |  |  |  |  |
Non-current derivative financial liabilities |  | 7.3 | 0.0 |  |  |  |  |
Trade And Other Receivable [member] |  |  |  |  |  |  |  |
Disclosure of changes in accounting estimates [line items] |  |  |  |  |  |  |  |
Derivative financial assets |  | $ 113.3 | $ 1.1 |  |  |  |  |
[1] | For the year ended 31 December 2018, the Group recognised an impairment of R6,470.9 million (US$481.5 million) in respect of the South Deep cash-generating unit due to the deferral of production. R963.9 million (US$71.7 million) of the total impairment was firstly allocated against goodwill and the remainder of R5,507.0 million (US$409.8 million) against other assets. The recoverable amount was based on its FVLCOD calculated using a combination of the market and the income approach (level 3 of the fair value hierarchy). No impairment or reversal of impairment was recognised in 2020 or 2019.

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- Definition The amount of current provision for decommissioning, restoration and rehabilitation costs. [Refer: Provision for decommissioning, restoration and rehabilitation costs] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Section D Examples: disclosures -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&doctype=Illustrative%20Examples&dita_xref=IAS37_IE_D_TI -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Paragraph 87 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_87&doctype=Standard -URIDate 2020-01-01 + Details
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