XML 455 R193.htm IDEA: XBRL DOCUMENT v3.21.1

Risk Management Activities - Schedule Of Effect Of A Change In Loss On Financial Instruments To Value The Gold Derivative Contracts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Value Of Reasonably Possible Decrease In Forward Prices (US$150) [Member]
Disclosure of Financial Risk Management [line items]
(Increase)/decrease in loss on financial instruments	$ 35.4	$ 120.8
Value Of Reasonably Possible Decrease in Forward Prices (US$100) [Member]
Disclosure of Financial Risk Management [line items]
(Increase)/decrease in loss on financial instruments	20.1	85.7
Value Of Reasonably Possible Decrease In Forward Prices (US$50) [Member]
Disclosure of Financial Risk Management [line items]
(Increase)/decrease in loss on financial instruments	8.6	45.4
Value Of Reasonably Possible Increase in Forward Prices US$50 [Member]
Disclosure of Financial Risk Management [line items]
(Increase)/decrease in loss on financial instruments	(6.5)	(48.7)
Value Of Reasonably Possible Increase in Forward Prices US$100 [Member]
Disclosure of Financial Risk Management [line items]
(Increase)/decrease in loss on financial instruments	(11.4)	(99.4)
Value Of Reasonably Possible Increase In Forward Prices US$150 [Member]
Disclosure of Financial Risk Management [line items]
(Increase)/decrease in loss on financial instruments	(15.0)	(151.1)
Percentage Of Reasonably Possible Decrease In Interest Rates (1.5%) [Member]
Disclosure of Financial Risk Management [line items]
(Increase)/decrease in loss on financial instruments	(5.2)	5.9
Percentage Of Reasonably Possible Decrease In Interest Rates (1.0%) [Member]
Disclosure of Financial Risk Management [line items]
(Increase)/decrease in loss on financial instruments	(2.9)	4.0
Percentage Of Reasonably Possible Decrease In Interest Rates (0.5%) [Member]
Disclosure of Financial Risk Management [line items]
(Increase)/decrease in loss on financial instruments	(0.8)	2.0
Percentage Of Reasonably Possible Increase in Interest Rates 0.5% [Member]
Disclosure of Financial Risk Management [line items]
(Increase)/decrease in loss on financial instruments	3.0	(2.1)
Percentage Of Reasonably Possible Increase In Interest Rates 1.0% [Member]
Disclosure of Financial Risk Management [line items]
(Increase)/decrease in loss on financial instruments	4.8	(4.2)
Percentage Of Reasonably Possible Increase In Interest Rates 1.5% [Member]
Disclosure of Financial Risk Management [line items]
(Increase)/decrease in loss on financial instruments	$ 6.4	$ (6.3)

X

- Definition

Line items represents information about financial risk management.

+ References

No definition available.

+ Details

Name:	gfi_DisclosureOfFinancialRiskManagementLineItems
Namespace Prefix:	gfi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of increase (decrease) in the fair value measurement of liabilities, recognised in profit or loss after tax, due to a reasonably possible increase in an unobservable input. [Refer: Tax income (expense)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 13
-IssueDate 2020-01-01
-Paragraph 93
-Subparagraph h
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_h_ii&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_IncreaseDecreaseInFairValueMeasurementDueToReasonablyPossibleIncreaseInUnobservableInputRecognisedInProfitOrLossAfterTaxLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_MeasurementAxis=gfi_ValueOfReasonablyPossibleDecreaseInForwardPricesUSDollar150Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MeasurementAxis=gfi_ValueOfReasonablyPossibleDecreaseinForwardPricesUSDollar100Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MeasurementAxis=gfi_ValueOfReasonablyPossibleDecreaseInForwardPricesUSDollar50Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MeasurementAxis=gfi_ValueOfReasonablyPossibleIncreaseinForwardPricesUSDollar50Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MeasurementAxis=gfi_ValueOfReasonablyPossibleIncreaseinForwardPricesUSDollar100Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MeasurementAxis=gfi_ValueOfReasonablyPossibleIncreaseInForwardPricesUSDollar150Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MeasurementAxis=gfi_PercentageOfReasonablyPossibleDecreaseInInterestRatesOnePointFivePecentageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MeasurementAxis=gfi_PercentageOfReasonablyPossibleDecreaseInInterestRatesOnePointZeroPecentageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MeasurementAxis=gfi_PercentageOfReasonablyPossibleDecreaseInInterestRatesZeroPointFivePecentageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MeasurementAxis=gfi_PercentageOfReasonablyPossibleIncreaseinInterestRatesZeroPointFivePecentageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MeasurementAxis=gfi_PercentageOfReasonablyPossibleIncreaseInInterestRatesOnePointZeroPecentageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MeasurementAxis=gfi_PercentageOfReasonablyPossibleIncreaseInInterestRatesOnePointFivePecentageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: