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Impairment, Net of Reversal of Impairment of Investments and Assets - Summary of Impairment, Net of Reversal of Impairment of Investments and Assets (Detail) R in Millions, $ in Millions | 12 Months Ended
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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)
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |
Investments |  | $ (36.9) |  |  | $ (3.7) |  |  | $ (0.1) |  |
Property, plant and equipment |  | (411.7) |  |  | 81.3 |  |  | (76.4) |  |
Goodwill |  | (71.7) |  |  | (277.8) |  |  | 0.0 |  |
Impairment, net of reversal of impairment of investments and assets |  | (520.3) |  |  | (200.2) |  |  | (76.5) |  |
Other [member] |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |
(Impairment)/reversal of impairment of property, plant and equipment | [1] | (1.9) |  |  | 42.3 |  |  | (76.4) |  |
Arctic Platinum Project [Member] |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |
(Impairment)/reversal of impairment of property, plant and equipment | [2] | 0.0 |  |  | 39.0 |  |  | 0.0 |  |
South Deep Mine [member] |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |
South Deep cash-generating unit |  | (481.5) |  | R (6,470,900.0) | (277.8) |  | R (3,495,000.0) | 0.0 |  | R 0.0
South Deep Mine [member] | Other impaired assets [member] |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |
South Deep cash-generating unit |  | (409.8) | [3] | (5,507.0) | 0.0 | [3] | 0.0 | 0.0 | [3] |
South Deep Mine [member] | Goodwill [member] |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |
Goodwill |  | (71.7) | [3] | R (963.9) | (277.8) | [3] | R (3,495.0) | 0.0 | [3] |
Far Southeast Gold Resources Incorporated [member] |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |
Investments | [4] | (36.9) |  |  | 0.0 |  |  | 0.0 |  |
Investments - listed [member] |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |
Investments |  | 0.0 |  |  | (0.5) |  |  | (0.1) |  |
Investments - unlisted [member] |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |
Investments |  | $ 0.0 |  |  | $ (3.2) |  |  | $ 0.0 |  |
[1] | (Impairment)/reversal of impairment of property, plant and equipment - other is made up as follows:
[2] | Refer note 12.2 for further details. The reversal of impairment was included in the "Corporate and other" segment.
[3] | 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.
[4] | Following the identification of impairment indicators at 31 December 2018, FSE was valued at its recoverable amount which resulted in an impairment of US$36.9 million. The recoverable amount was based on the fair value less cost of disposal ("FVLCOD") of the investment (level 2 in the fair value hierarchy). The FVLCOD was indirectly derived from the market value of Lepanto Consolidated Mining Company, being the 60% shareholder of FSE. The impairment is included in the "Corporate and other" segment.

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