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Segment Report - Schedule of Segment Report (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of operating segments [line items] |  |  |
Tax rate included in South Deep | 29.00% | 30.00% | 30.00%
Equity Accounted Joint Venture | $ 177.5 | $ 128.6 | $ 0.0
Share of loss of associates after taxation included in other income | (13.1) | (1.3) | (2.3)
Revenue from the sale of copper | 169.2 | 177.8 | 130.6
Profit on disposal of investments | 0.0 | 0.0 | 2.3
Corporate and other [member] | Other income/cost [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Share of loss of associates after taxation included in other income | (13.1) | (1.3) | (2.3)
Corporate related costs | 31.4 | $ 9.0 | 23.1
Profit on disposal of investments |  |  | $ 2.3
Asanko [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Equity Accounted Joint Venture | $ 85.8 |  |

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