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Risk Management Activities - Schedule of Combined Maximum Credit Risk Exposure (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Trade and other receivable [member] |  |
Disclosure of credit risk exposure [line items] |  |
VAT, import duties, prepayments, payroll receivables, derivative contracts and diesel rebates | $ 186.9 | $ 61.8

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- Definition VAT, import duties, prepayments, payroll receivables, derivative contracts and diesel rebates. + References No definition available. + Details
Name: | gfi_ValueAddedTaxImportDutiesPrepaymentsPayrollReceivablesDerivativeContractsAndDieselRebatesReceivables
Namespace Prefix: | gfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfCreditRiskExposureLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_TradeReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |