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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 (Parenthetical) (Detail) oz in Millions, R in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) $ / oz R / kg Exchange_Rate oz | Dec. 31, 2018 ZAR (R) Exchange_Rate oz | Dec. 31, 2017 USD ($) | Dec. 31, 2017 ZAR (R) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 ZAR (R) | Dec. 31, 2020 R / kg | Dec. 31, 2019 R / kg | Dec. 31, 2018 ZAR (R) $ / oz R / kg
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments |  | $ 36.9 |  |  | $ 3.7 |  |  | $ 0.1 |  |  |  |  |
Group impairment recognised |  | $ 71.7 |  |  | $ 277.8 |  |  | 0.0 |  |  |  |  |
Nominal discount rate |  | 13.50% |  | 13.50% | 13.50% |  | 13.50% |  |  |  |  |  |
Far Southeast Gold Resources Incorporated [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investments | [1] | $ 36.9 |  |  | $ 0.0 |  |  | 0.0 |  |  |  |  |
Equity method investment ownership percentage |  | 60.00% |  | 60.00% |  |  |  |  |  |  |  |  |
South Deep Mine [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Group impairment recognised |  | $ 481.5 |  | R 6,470,900.0 | 277.8 |  | R 3,495,000.0 | 0.0 |  | R 0.0 |  |  |
Resource price | $ / oz |  | 17 |  |  |  |  |  |  |  |  |  |  | 17
Rand/Dollar exchange rate | Exchange_Rate |  | 14.63 |  | 14.63 |  |  |  |  |  |  |  |  |
Resource ounces | oz |  | 24.5 |  | 24.5 |  |  |  |  |  |  |  |  |
Life time of mine |  | 75 years |  | 75 years |  |  |  |  |  |  |  |  |
Nominal discount rate |  | 13.50% |  | 13.50% |  |  |  |  |  |  |  |  |
Gold price | R / kg |  | 525,000 |  |  |  |  |  |  |  |  | 550,000 | 525,000 | 525,000
Impairment recoverable amount |  | $ 1,400.0 |  |  |  |  |  |  |  |  |  |  | R 21,200.0
South Deep Mine [member] | Thereafter [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gold price | R / kg |  | 550,000 |  |  |  |  |  |  |  |  |  |  | 550,000
Other impaired assets [member] | South Deep Mine [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Group impairment recognised |  | $ 409.8 | [2] | R 5,507.0 | 0.0 | [2] | 0.0 | 0.0 | [2] |  |  |  |
Goodwill [member] | South Deep Mine [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Group impairment recognised |  | 71.7 | [2] | R 963.9 | 277.8 | [2] | R 3,495.0 | 0.0 | [2] |  |  |  |
Other Property, Pant and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
(Impairment)/reversal of impairment of property, plant and equipment - other |  | 0.0 |  |  | 53.4 |  |  | (66.4) |  |  |  |  |
Other Property, Pant and Equipment [Member] | Redundant Assets at Cerro Corona [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
- Redundant assets at Cerro Corona |  | (1.9) |  |  | (0.8) |  |  | 0.0 |  |  |  |  |
Other Property, Pant and Equipment [Member] | Damang Asset Held For Sale [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss recognised |  | 0.0 |  |  | 0.0 |  |  | (7.6) |  |  |  |  |
Other Property, Pant and Equipment [Member] | Assets Specific Impairment At Tarkwa [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss recognised |  | 0.0 |  |  | (6.8) |  |  | 0.0 |  |  |  |  |
Other Property, Pant and Equipment [Member] | Assets Specific Impairment At Damang [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss recognised |  | 0.0 |  |  | (3.5) |  |  | (2.4) |  |  |  |  |
Other [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
(Impairment)/reversal of impairment of property, plant and equipment - other | [3] | $ (1.9) |  |  | $ 42.3 |  |  | $ (76.4) |  |  |  |  |
[1] | 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.
[2] | 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.
[3] | (Impairment)/reversal of impairment of property, plant and equipment - other is made up as follows:

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