Name:	ifrs-full_DisclosureOfBusinessCombinationsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2019-01-01
-Paragraph B64
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B64_c&doctype=Appendix&subtype=B
-URIDate 2019-03-27

Name:	ifrs-full_PercentageOfVotingEquityInterestsAcquired
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The profit (loss) of the acquiree, since the acquisition date, included in the consolidated statement of comprehensive income. [Refer: Profit (loss)]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2019-01-01
-Paragraph B64
-Subparagraph q
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B64_q_i&doctype=Appendix&subtype=B
-URIDate 2019-03-27

Name:	ifrs-full_ProfitLossOfAcquiree
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of revenue of the acquiree since the acquisition date included in the consolidated statement of comprehensive income. [Refer: Revenue]

Name:	ifrs-full_RevenueOfAcquiree
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The number of shares of the acquiree obtained in the business combination.

No definition available.

Name:	sbgl_NumberOfSharesAcquiredInBusinessCombination
Namespace Prefix:	sbgl_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The percentage discount applied to the price in exercising options to purchase shares of the subsidiary.

No definition available.

Name:	sbgl_OptionToObtainSharesInSubsidiaryPriceDiscountAsPercent
Namespace Prefix:	sbgl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The period of time for which results are included, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	sbgl_PeriodOfTimeForWhichResultsAreIncluded
Namespace Prefix:	sbgl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The potential ownership in the subsidiary, as a percent, if options to subscribe to ordinary shares are effected.

No definition available.

Name:	sbgl_PotentialOwnershipInSubsidiary
Namespace Prefix:	sbgl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The amount of transaction costs related to the acquisition of assets and assumption of liabilities assumed, and borrowings recognised in profit or loss.

No definition available.