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Retirement Benefits (Tables)
12 Months Ended
Dec. 31, 2023
Disclosure Of Defined Contribution Plan [abstract]  
Summary of retirement benefits
United States Dollar
Figures in millions unless otherwise stated
2023
2022
2021
All employees are members of various defined contribution
retirement schemes.
Contributions to the various retirement schemes are fully
expensed during the period in which they are incurred.
Retirement benefit costs
33.8
35.0
32.9