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Share-based payments - Board of Directors Incentive Plan (BoDIP) (Details) - BODIP	1 Months Ended	12 Months Ended
	Apr. 30, 2018 $ / shares	Dec. 31, 2019 EquityInstruments $ / shares	Dec. 31, 2018 $ / shares	Dec. 31, 2017 $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	4 years
Exercise price | $ / shares	$ 16.12	$ 16.80	$ 16.12	$ 26.29
Shares available to be exercised | EquityInstruments		2,072,344

X

- Definition

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.

+ References

No definition available.

+ Details

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- Definition

The number of share options exercisable in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 45
-Subparagraph b
-Clause vii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_vii&doctype=Standard
-URIDate 2019-03-27

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X

- Definition

The weighted average exercise price of share options exercised in a share-based payment arrangement. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 45
-Subparagraph b
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_iv&doctype=Standard
-URIDate 2019-03-27

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- Definition

Period which the right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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