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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
--- | --- | ---
Jun. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) $ / oz R / kg Exchange_Rate oz | Dec. 31, 2017 ZAR (R) Exchange_Rate oz | Dec. 31, 2016 USD ($) $ / oz | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Disclosures of impairment of investments and assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments |  |  | $ 3.7 |  |  | $ 0.1 |  | $ 117.4 |  |  |
Carrying value |  |  | 4,892.9 |  |  | 4,524.6 | [1] | 4,295.6 | [1] |  |
Reversal of impairment and impairment of property, plant and equipment - other, net |  |  | 42.3 |  |  | (76.4) |  | (42.5) |  |  |
South Deep goodwill |  |  | $ 277.8 |  |  | $ 0.0 |  | 0.0 |  |  |
Resource price | $ / oz |  |  | 17.0 |  |  | 60.0 |  |  |  |  |
Nominal discount rate |  |  | 13.50% |  | 13.50% | 13.50% |  |  |  |  |
South Deep Mine [member] |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
South Deep goodwill |  |  | $ 277.8 |  | R 3,495.0 |  |  |  |  |  |
Gold price | R / kg |  |  | 525,000 |  |  |  |  |  |  |  |
Resource price | $ / oz |  |  | 17 |  |  |  |  |  |  |  |
Rand/Dollar exchange rate | Exchange_Rate |  |  | 12.58 |  | 12.58 |  |  |  |  |  |
Resource ounces | oz |  |  | 29 |  | 29 |  |  |  |  |  |
Life time of mine |  |  | 78 years |  | 78 years |  |  |  |  |  |
Nominal discount rate |  |  | 13.50% |  | 13.50% |  |  |  |  |  |
Other Property, Pant and Equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reversal of impairment and impairment of property, plant and equipment - other, net |  |  | $ 53.4 |  |  | $ (66.4) |  | 0.0 |  |  |
Other Property, Pant and Equipment [Member] | Redundant Assets at Cerro Corona [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  | (66.4) |  |  |  |  |
Total impairment of property, plant and equipment - other |  |  | (0.8) |  |  | 0.0 |  | (6.7) |  |  |
Other Property, Pant and Equipment [Member] | Damang Asset Held For Sale [member] |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  | 0.0 |  |  | (7.6) |  | 0.0 |  |  |
Other Property, Pant and Equipment [Member] | Assets Specific Impairment At Tarkwa [member] |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  | (6.8) |  |  | 0.0 |  | 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 |  |  | (3.5) |  |  | (2.4) |  | (35.8) |  |  |
APP [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  |  |  |  | 1.0 |  | 1.0 |  | $ 40.0 |
Purchase offer, cash |  |  | $ 40.0 |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  | (39.0) |  | $ (3.2) | $ (89.7)
Purchase offer, refiner royalty offered percentage |  |  | 2.00% |  | 2.00% |  |  |  |  |  |
Hummingbird Resources Plc [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments |  | $ 7.5 | $ 0.0 | [2] |  | 0.0 | [2] | 7.5 | [2] |  |
Far Southeast Gold Resources Incorporated [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosures of impairment of investments and assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investments | [3] |  | $ 0.0 |  |  | $ 0.0 |  | $ 101.4 |  |  |
Percentage shareholder of FSE |  |  |  |  |  |  |  | 60.00% |  |  |
[1] | As Restated - Refer note 40 for further details.
[2] | Following the identification of impairment indicators at 30 June 2015, the investment in Hummingbird was valued at its recoverable amount, which resulted in an impairment of US$7.5 million. The recoverable amount was based on the investment's fair value at the time, being its quoted market price (level 1 of the fair value hierarchy). The impairment is included in the "Corporate and other" segment.
[3] | Following the identification of impairment indicators at 31 December 2015, FSE was valued at its recoverable amount which resulted in an impairment of US$101.4 million. The recoverable amount was based on the fair value less cost of disposal ("FVLCOD") of the investment (level 2 of the fair value hierarchy). 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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