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Trade and Other Payables - Schedule of Derivative Financial Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of Detailed Information about Derivative Financial Libilities Explanatory [Line Items] |  |
Derivative financial liabilities held for hedging | $ 29.1 | $ 127.6
Non-current derivative financial liabilities | (7.3) | 0.0
Derivative financial liabilities | 21.8 | 127.6
Ghanaian Oil Derivative Contracts [member] |  |
Disclosure of Detailed Information about Derivative Financial Libilities Explanatory [Line Items] |  |
Derivative financial liabilities held for hedging | 10.0 | 0.0
Australian Oil Derivative Contracts [member] |  |
Disclosure of Detailed Information about Derivative Financial Libilities Explanatory [Line Items] |  |
Derivative financial liabilities held for hedging | 5.1 | 0.0
Peruvian copper derivative contracts [member] |  |
Disclosure of Detailed Information about Derivative Financial Libilities Explanatory [Line Items] |  |
Derivative financial liabilities held for hedging | 14.0 | 0.0
Australian gold derivative contracts [member] |  |
Disclosure of Detailed Information about Derivative Financial Libilities Explanatory [Line Items] |  |
Derivative financial liabilities held for hedging | 0.0 | 78.3
South Deep Gold Derivative Contracts [Member] |  |
Disclosure of Detailed Information about Derivative Financial Libilities Explanatory [Line Items] |  |
Derivative financial liabilities held for hedging | 0.0 | 12.6
Ghanaian gold derivative contracts [member] |  |
Disclosure of Detailed Information about Derivative Financial Libilities Explanatory [Line Items] |  |
Derivative financial liabilities held for hedging | 0.0 | 36.4
Australian Foreign Currency Derivative Contracts [Member] |  |
Disclosure of Detailed Information about Derivative Financial Libilities Explanatory [Line Items] |  |
Derivative financial liabilities held for hedging | $ 0.0 | $ 0.3

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