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Provisions - Summary of Silicosis Settlement Costs (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Provisions [abstract] |  |
Balance at beginning of the year | $ 31.9 | $ 0.0
Changes in estimates | (4.5) | 30.2
Unwinding of provision recognised as finance expense | 2.0 | 0.9
Translation | (4.3) | 0.8
Balance at end of the year | $ 25.1 | $ 31.9

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- Definition Provision for change in estimate. + References No definition available. + Details
Name: | gfi_ProvisionForChangeInEstimate
Namespace Prefix: | gfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Silicosis settlement costs. + References No definition available. + Details
Name: | gfi_SilicosisSettlementCosts
Namespace Prefix: | gfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Silicosis settlement costs before provision adjustments and translation. + References No definition available. + Details
Name: | gfi_SilicosisSettlementCostsBeforeProvisionAdjustmentsAndTranslation
Namespace Prefix: | gfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Translation + References No definition available. + Details
Name: | gfi_Translation
Namespace Prefix: | gfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Unwinding of provision recognised as finance expense + References No definition available. + Details
Name: | gfi_UnwindingOfProvisionRecognisedAsFinanceExpense
Namespace Prefix: | gfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | ifrs-full_ProvisionsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration