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Basis of preparation - Leases (Details)	Jun. 30, 2019
South Africa | Minimum
Disclosure of initial application of standards or interpretations
Incremental borrowing rate	8.20%
South Africa | Maximum
Disclosure of initial application of standards or interpretations
Incremental borrowing rate	11.50%
Eurasia | Minimum
Disclosure of initial application of standards or interpretations
Incremental borrowing rate	0.90%
Eurasia | Maximum
Disclosure of initial application of standards or interpretations
Incremental borrowing rate	8.10%
United States of America | Minimum
Disclosure of initial application of standards or interpretations
Incremental borrowing rate	3.70%
United States of America | Maximum
Disclosure of initial application of standards or interpretations
Incremental borrowing rate	5.60%

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The weighted average lessee's incremental borrowing rate applied to lease liabilities recognised in the statement of financial position at the date of initial application of IFRS 16. The incremental borrowing rate is the rate of interest that a lessee would have to pay to borrow over a similar term, and with a similar security, the funds necessary to obtain an asset of a similar value to the right-of-use asset in a similar economic environment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph C12
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_C12_a&doctype=Appendix&subtype=C
-URIDate 2019-03-27

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