XML 193 R186.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Risk Management Activities - Summary of Effect of Change in Finance Expense on Group's Profit or Loss had LIBOR and Prime Differed as Indicated (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Decrease of One Point Five Percentage [Member] | Sensitivity to interest rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | $ (14.1) | $ (12.6)
Decrease of One Point Five Percentage [Member] | Sensitivity to interest rates [member] | Change in London Interbank Offered Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (11.3) | (12.0)
Decrease of One Point Five Percentage [Member] | Sensitivity to interest rates [member] | Change in Bank Bill Swap Bid Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (0.8) |
Decrease of One Point Five Percentage [Member] | Sensitivity to interest rates [member] | Johannesburg Interbank Average Rate and Prime Interest Rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (2.0) | (0.6)
Decrease of One Percentage [Member] | Sensitivity to interest rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (9.3) | (8.4)
Decrease of One Percentage [Member] | Sensitivity to interest rates [member] | Change in London Interbank Offered Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (7.5) | (8.0)
Decrease of One Percentage [Member] | Sensitivity to interest rates [member] | Change in Bank Bill Swap Bid Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (0.5) |
Decrease of One Percentage [Member] | Sensitivity to interest rates [member] | Johannesburg Interbank Average Rate and Prime Interest Rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (1.3) | (0.4)
Decrease of Zero Point Five Percentage [Member] | Sensitivity to interest rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (4.8) | (4.2)
Decrease of Zero Point Five Percentage [Member] | Sensitivity to interest rates [member] | Change in London Interbank Offered Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (3.8) | (4.0)
Decrease of Zero Point Five Percentage [Member] | Sensitivity to interest rates [member] | Change in Bank Bill Swap Bid Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (0.3) |
Decrease of Zero Point Five Percentage [Member] | Sensitivity to interest rates [member] | Johannesburg Interbank Average Rate and Prime Interest Rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | (0.7) | (0.2)
Increase of Zero Point Percentage Points [Member] | Sensitivity to interest rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 4.8 | 4.2
Increase of Zero Point Percentage Points [Member] | Sensitivity to interest rates [member] | Change in London Interbank Offered Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 3.8 | 4.0
Increase of Zero Point Percentage Points [Member] | Sensitivity to interest rates [member] | Change in Bank Bill Swap Bid Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 0.3 |
Increase of Zero Point Percentage Points [Member] | Sensitivity to interest rates [member] | Johannesburg Interbank Average Rate and Prime Interest Rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 0.7 | 0.2
Increase of One Percentage [Member] | Sensitivity to interest rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 9.3 | 8.4
Increase of One Percentage [Member] | Sensitivity to interest rates [member] | Change in London Interbank Offered Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 7.5 | 8.0
Increase of One Percentage [Member] | Sensitivity to interest rates [member] | Change in Bank Bill Swap Bid Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 0.5 |
Increase of One Percentage [Member] | Sensitivity to interest rates [member] | Johannesburg Interbank Average Rate and Prime Interest Rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 1.3 | 0.4
Increase of One Point Five Percentage [Member] | Sensitivity to interest rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 14.1 | 12.6
Increase of One Point Five Percentage [Member] | Sensitivity to interest rates [member] | Change in London Interbank Offered Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 11.3 | 12.0
Increase of One Point Five Percentage [Member] | Sensitivity to interest rates [member] | Change in Bank Bill Swap Bid Rate [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 0.8 |
Increase of One Point Five Percentage [Member] | Sensitivity to interest rates [member] | Johannesburg Interbank Average Rate and Prime Interest Rates [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in finance expense | 2.0 | 0.6
Decrease of Ten Percentage [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
(Decrease)/increase in other comprehensive income | (9.9) | (1.1)
Decrease Of Five Percentage [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
(Decrease)/increase in other comprehensive income | (5.0) | (0.5)
Increase Of Five Percentage [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
(Decrease)/increase in other comprehensive income | 5.0 | 0.5
Increase of Ten Percentage [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
(Decrease)/increase in other comprehensive income | $ 9.9 | $ 1.1

X
- Definition Change in interest expense due to change in interest rate. + References No definition available. + Details
Name: | gfi_ChangeInInterestExpenseDueToChangeInInterestRate
Namespace Prefix: | gfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Change in other comprehensive income due to change in equity price. + References No definition available. + Details
Name: | gfi_ChangeInOtherComprehensiveIncomeDueToChangeInEquityPrice
Namespace Prefix: | gfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | gfi_SensitivityAnalysisAxis=gfi_DecreaseOfOnePointFivePercentageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_InterestRateRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gfi_InterestRateRiskAxis=gfi_ChangeInLondonInterbankOfferedRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gfi_InterestRateRiskAxis=gfi_ChangeInBankBillSwapBidRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gfi_InterestRateRiskAxis=gfi_ChangeInJohannesburgInterbankAverageRateAndPrimeInterestRatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gfi_SensitivityAnalysisAxis=gfi_DecreaseOfOnePercentageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gfi_SensitivityAnalysisAxis=gfi_DecreaseOfZeroPointFivePercentageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gfi_SensitivityAnalysisAxis=gfi_IncreaseOfZeroPointPercentagePointsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gfi_SensitivityAnalysisAxis=gfi_IncreaseOfOnePercentageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gfi_SensitivityAnalysisAxis=gfi_IncreaseOfOnePointFivePercentageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gfi_SensitivityAnalysisAxis=gfi_DecreaseOfTenPercentageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gfi_SensitivityAnalysisAxis=gfi_DecreaseOfFivePercentageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gfi_SensitivityAnalysisAxis=gfi_IncreaseOfFivePercentageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gfi_SensitivityAnalysisAxis=gfi_IncreaseOfTenPercentageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |