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Environmental Trust Funds - Schedule of Environmental Trust Funds (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Environmental Trust Funds [abstract]
Balance at beginning of the year	$ 69.5	$ 60.8
Contributions	8.7	7.1
Interest earned	0.7	0.7	$ 0.6
Translation adjustment	0.4	0.9
Balance at end of the year	$ 79.3	$ 69.5	$ 60.8

X

- Definition

The amount of contributions into funds intended to fund environmental rehabilitation obligations of the entity.

+ References

No definition available.

+ Details

Name:	gfi_ContributionsEnvironmentalTrustFunds
Namespace Prefix:	gfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The funds intended to fund environmental rehabilitation obligations of the entity and are not available for general purposes of the entity.

+ References

No definition available.

+ Details

Name:	gfi_EnvironmentalTrustFunds
Namespace Prefix:	gfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Environmental trust fund.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of interest earned on funds intended to fund environmental rehabilitation obligations of the entity.

+ References

No definition available.

+ Details

Name:	gfi_InterestEarnedEnvironmentalTrustFund
Namespace Prefix:	gfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of exchange differences arising on funds intended to fund environmental rehabilitation obligations of the entity.

+ References

No definition available.

+ Details

Name:	gfi_TranslationAdjustmentEnvironmentalTrustFund
Namespace Prefix:	gfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration