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Consolidated Statements of Changes in Equity - Parenthetical - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Changes in equity [abstract] |  |  |
Number of shares authorised (in shares) | 3,500,000,000 | 3,500,000,000 | 3,500,000,000
Par value per share (in dollars per share) | $ 1.00 | $ 1.00 | $ 1.00
Number of shares issued (in shares) | 2,004,743,442 | 2,004,743,442 | 2,004,743,442
Legal reserve | $ 200.5 | $ 200.5 | $ 200.5
Undistributable reserve | $ 1,400.0 | $ 1,400.0 | $ 1,400.0
Dividends paid, per share (in dollars per share) | $ 0.29 | $ 0.27 | $ 0.29
Dividends paid, USD per ADS (in dollars per share) | $ 2.90 | $ 2.70 | $ 2.90
Dividends not paid on Treasury Shares | $ 12.1 | $ 11.2 | $ 12.1
Treasury shares |  |  |
Changes in equity [abstract] |  |  |
Number of shares in entity held by entity or by its subsidiaries or associates | 41,666,666 | 41,666,666 | 41,666,666
Acquisition reserve |  |  |
Changes in equity [abstract] |  |  |
Other reserves | $ (72.4) | $ (72.4) | $ (72.2)

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- Definition The amount of dividends paid per ordinary share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2023-01-01 -Paragraph 16A -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=34&code=ifrs-tx-2023-en-r&anchor=para_16A_f&doctype=Standard -URIDate 2023-03-23 + Details
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