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Segment Report - Schedule of Segment Report (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of operating segments [line items] |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  | 30.00% |
Tax rate included in South Deep | 30.00% | 30.00% |  |  |
Share of loss of associates after taxation included in other income | $ (1.3) | $ (2.3) | [1] | $ (5.7) | [1]
Profit on disposal of investments | 0.0 | 2.3 | [1] | 0.1 | [1]
Other income/cost [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
Share of loss of associates after taxation included in other income | (1.3) |  |  |  |
Corporate related costs | $ 9.0 |  |  |  |
Other income [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
Share of loss of associates after taxation included in other income |  | (2.3) |  |  |
Profit on disposal of investments |  | 2.3 |  |  |
Corporate related costs |  | $ 23.1 |  |  |
Cost [member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
Share of loss of associates after taxation included in other income |  |  |  | (5.7) |
Profit on disposal of investments |  |  |  | 0.1 |
Corporate related costs |  |  |  | $ 6.2 |
[1] | As Restated - Refer note 40 for further details.

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