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Share-based compensation - Weighted average assumptions (Details) - SARs and TSARs	12 Months Ended
	Dec. 31, 2019 USD ($) year	Dec. 31, 2018 USD ($) year
Disclosure of terms and conditions of share-based payment arrangement [line items]
Risk-free interest rate	1.60%	2.60%
Expected dividend yield	3.70%	2.70%
Expected life of SARs and TSARs (years) | year	1.2	1.5
Expected volatility	38.00%	35.00%
Expected forfeitures	0.10%	0.20%
Weighted average fair value (USD per share) | $	$ 3.03	$ 7.93

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2019-03-27

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Expected Volatility, Other Equity Instruments Granted

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