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Segment Report - Schedule of Segment Report (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of operating segments [line items] |  |  |
Equity Accounted Joint Venture | $ 233.3 | $ 172.0 |
Share of loss of associates after taxation included in other income | (2.6) | 3.1 | $ (13.1)
Revenue from the sale of copper | 144.1 | 165.1 | 169.2
Asanko Gold [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Equity Accounted Joint Venture | 88.9 | 89.9 |
Asanko Gold - impairment | (49.5) |  |
Mining assets [member] | Asanko Gold [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Asanko Gold - impairment | 49.5 |  |
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 | 2.6 | 3.1 | 13.1
Corporate related costs | 8.3 | 18.9 | 31.4
Repurchase of notes, value |  | 1,000.0 |
Gain loss on repurchase of notes |  | 5.0 |
Salaries VAT Income | 23.9 |  |
Asanko [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Equity Accounted Joint Venture | $ 88.9 | $ 89.9 | $ 85.8
South deep [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Tax rate included in South Deep | 29.00% | 29.00% | 29.00%

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