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Equity - Share Capital - Movement in Outstanding Shares (Details) - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Class A, Ordinary shares |  |
Reconciliation of number of shares outstanding |  |
Number of shares outstanding at beginning of the year | 426,129,798 | 426,129,798
Number of shares outstanding at end of the year | 426,129,798 | 426,129,798
Class B, Preference shares |  |
Reconciliation of number of shares outstanding |  |
Number of shares outstanding at beginning of the year | 257,606,659 | 257,127,304
(Acquisition) / disposal of treasury stock | 403,399 | 479,355
Number of shares outstanding at end of the year | 258,010,058 | 257,606,659

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- Definition The increase (decrease) in the number of shares outstanding. [Refer: Number of shares outstanding] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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