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Earnings Per Share - Weighted Average Ordinary Shares Outstanding Basic (Details) - shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Weighted average ordinary shares and adjusted weighted average ordinary shares [abstract] |  |  |
Issued shares outstanding at 1 January (in shares) | 684,794,839 | 684,346,294 | 683,854,491
Effect of treasury stock (in shares) | 320,997 | 363,083 | 342,785
Average weighted number of ordinary shares outstanding (basic) at 31 December (in shares) | 685,115,836 | 684,709,377 | 684,197,276

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- Definition Effect of treasury stock. + References No definition available. + Details
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- Definition Weighted average number of ordinary shares outstanding at the beginning of the period. + References No definition available. + Details
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- Definition The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_70_b&doctype=Standard -URIDate 2019-03-27 + Details
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