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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 |  |

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- 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 + Details
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- 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 + Details
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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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- Details
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