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Share-based compensation - Disclosure of number and weighted average exercise prices of share options (Details) | 12 Months Ended
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Dec. 31, 2021 shares $ / shares | Dec. 31, 2020 shares $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of share options outstanding, beginning of period | shares | 4,240,869 | 4,939,344
Weighted average exercise price share options, beginning of period | $ / shares | $ 14.22 | $ 14.40
Number of share options granted | shares | 763,700 | 1,201,100
Weighted average exercise price of share options granted | $ / shares | $ 13.27 | $ 13.51
Number of share options exercised | shares | (1,043,903) | (673,470)
Weighted average exercise price of share options exercised | $ / shares | $ 13.75 | $ 11.27
Number of share options forfeited | shares | (58,866) | (341,300)
Weighted average exercise price of share options forfeited | $ / shares | $ 13.45 | $ 13.61
Number of share options expired | shares | (171,220) | (884,805)
Weighted average exercise price of share options expired | $ / shares | $ 16.04 | $ 16.56
Number of share options outstanding, end of period | shares | 3,730,580 | 4,240,869
Weighted average exercise price share options, end of period | $ / shares | $ 14.09 | $ 14.22
Number of share options exercisable | shares | 1,881,416 | 2,988,713
Weighted average exercise price of share options exercisable | $ / shares | $ 14.78 | $ 14.96

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- Definition The number of share options outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_d&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_i&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_vi&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 45 -Subparagraph b -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_vii&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The number of share options exercised in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_iv&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The number of share options expired in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph b -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_v&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The number of share options forfeited in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_iii&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The weighted average exercise price of share options expired 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 2021-01-01 -Paragraph 45 -Subparagraph b -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_v&doctype=Standard -URIDate 2021-03-24 + Details
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