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Trade and Other Receivables - Schedule of Derivative Financial Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Detailed Information about Derivative Financial Assets Explanatory [Line Items] |  |
Derivative financial assets held for hedging | $ 113.3 | $ 1.1
Non-current derivative financial assets | (31.4) | 0.0
Current derivative financial assets | 81.9 | 1.1
Australian gold derivative contracts [member] |  |
Disclosure Of Detailed Information about Derivative Financial Assets Explanatory [Line Items] |  |
Derivative financial assets held for hedging | 27.3 | 0.0
Salares Norte foreign currency derivative contracts [Member] |  |
Disclosure Of Detailed Information about Derivative Financial Assets Explanatory [Line Items] |  |
Derivative financial assets held for hedging | 86.0 | 0.0
Australian oil derivative contracts [member] |  |
Disclosure Of Detailed Information about Derivative Financial Assets Explanatory [Line Items] |  |
Derivative financial assets held for hedging | 0.0 | 1.0
Ghanaian oil derivative contracts [member] |  |
Disclosure Of Detailed Information about Derivative Financial Assets Explanatory [Line Items] |  |
Derivative financial assets held for hedging | $ 0.0 | $ 0.1

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