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Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2021

Disclosure Of Defined Contribution Plan [abstract]

Summary of retirement benefits

			United States Dollar
Figures in millions unless otherwise stated			2021			2020			2019
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			32.9			28.8			27.0

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