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Accounting Policies - Leases (Details)	Jan. 01, 2019
U.S. dollars leases
Leases
Lessee's incremental borrowing rate applied to the lease liabilities on adoption of IFRS 16	4.70%
Mexican peso leases
Leases
Lessee's incremental borrowing rate applied to the lease liabilities on adoption of IFRS 16	10.60%

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- References

No definition available.

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- Definition

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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