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Consolidated Statements of Changes in Equity - Parenthetical - USD ($)
$ in Millions
 12 Months Ended
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)