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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: