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Consolidated income statement (parenthetical) - shares shares in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Profit or loss [abstract] |  |  |  |  |
Weighted average number of shares outstanding (in shares) | 489.0 | [1] | 488.2 | 488.2 | [1]
[1] | For periods prior to the Spin-off, the denominator for basic and diluted (loss) per share was calculated using 488.2 million shares of common stock distributed in the Spin-off.

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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 2020-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_70_b&doctype=Standard -URIDate 2020-01-01 + Details
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