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v3.19.1

Property, Plant and Equipment - Summary of Property, Plant and Equipment (Parenthetical) (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)
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |
Carrying value of asset |  | $ 4,259.2 |  |  | $ 4,892.9 |  |  |  |  |
Borrowing costs |  | $ 17.5 |  |  | $ 22.9 |  |  | $ 15.1 |  |
Average interest capitalisation rate |  | 5.90% |  | 5.90% | 5.30% |  | 5.30% |  |  |
Write-off of exploration and evaluation assets - continuing operations |  | $ 37.7 |  |  | $ 51.5 |  |  | 41.4 |  |
Exploration expense |  | 104.2 |  |  | 109.8 |  |  | 86.1 |  |
Accumulated depreciation and impairment [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |
Impairment and reversal of impairment, net |  | 411.7 |  |  | (81.3) |  |  |  |  |
Impairment |  | 1.9 |  |  | 11.1 |  |  |  |  |
South Deep Mine [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |
Impairment |  | 481.5 |  | R 6,470,900.0 | 277.8 |  | R 3,495,000.0 | 0.0 |  | R 0.0
Cerro corona [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |
Reversal of impairment |  | 53.4 |  |  |  |  |  |  |  |
Senior secured revolving credit facility [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |
Assets pledged as security |  | 100.0 |  |  |  |  |  |  |  |
Damang Mining Fleet and Related Spare [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |
Borrowing costs |  | 9.9 |  |  | 2.1 |  |  |  |  |
Damang Mining Fleet and Related Spare [Member] | Gruyere Mining Company Pty Ltd [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |
Borrowing costs |  | 7.6 |  |  | 1.4 |  |  |  |  |
Damang Mining Fleet and Related Spare [Member] | South Deep Mine [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |
Borrowing costs |  | 0.0 |  |  | 19.4 |  |  |  |  |
Other impaired assets [member] | South Deep Mine [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |
Impairment |  | 409.8 | [1] | R 5,507.0 | 0.0 | [1] | R 0.0 | 0.0 | [1] |
Fleet assets [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |
Carrying value of asset |  | 0.0 |  |  | 183.6 |  |  |  |  |
Mine development infrastructure and other assets [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |
Carrying value of asset |  | 3,680.7 |  |  | 4,253.3 |  |  |  |  |
Mine development infrastructure and other assets [Member] | Exploration and evaluation assets [member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |
Carrying value of asset |  | 12.6 |  |  | 10.8 |  |  |  |  |
Arctic Platinum Project [Member] |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |  |
Reversal of impairment | [2] | $ 0.0 |  |  | $ 39.0 |  |  | $ 0.0 |  |
[1] | 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.
[2] | Refer note 12.2 for further details. The reversal of impairment was included in the "Corporate and other" segment.

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