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Summary of Results of Discontinued Operations (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Product sales | $ 310.7 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | $ 2,021.2 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Costs and expenses | (285.7)us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold | (1,737.8)us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold
Income before tax and share of equity investee's profits | 25.0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | 283.4 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
Income and mining tax expense | (5.4)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | 67.5 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Income before share of equity investee's profits | 19.6 gfi_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntityBeforeShareOfEquityInvesteesProfits | 350.9 gfi_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntityBeforeShareOfEquityInvesteesProfits
Share of equity investee's profits | 0.9 us-gaap_DiscontinuedOperationAmountOfOtherIncomeLossFromDispositionOfDiscontinuedOperationNetOfTax | 11.4 us-gaap_DiscontinuedOperationAmountOfOtherIncomeLossFromDispositionOfDiscontinuedOperationNetOfTax
Net income | 20.5 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 362.3 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Property, plant and equipment, net | 1,987.3 us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentCurrent |
Non-current investments | 187.0 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets |
Current assets | 285.4 us-gaap_DisposalGroupIncludingDiscontinuedOperationPrepaidAndOtherAssetsCurrent |
Current liabilities | (234.8)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayableAndAccruedLiabilitiesCurrent |
Non-current liabilities | (1,191.2)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities |
Net carrying value | 1,033.7 gfi_DisposalGroupIncludingDiscontinuedOperationNetCarryingValue |
Net asset value distributed | (1,033.7)gfi_DisposalGroupIncludingDiscontinuedOperationNetAssetValueDistributed |
Profit on distribution | $ 0 gfi_DisposalGroupIncludingDiscontinuedOperationProfitDistribution | $ 0 gfi_DisposalGroupIncludingDiscontinuedOperationProfitDistribution

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- Definition Profit on disposal/distribution of a disposal group, including discontinued operations, calculated as the amount that the selling price/net asset value distributed exceeds the net carrying amount of the disposal group/discontinued operation. + References No definition available. + Details
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- Definition Other income (loss) amounts, net of tax expense or benefit, relating to a disposal group that is classified as a component of the entity, exclusive of the following elsewhere enumerated categories: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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