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Our people - Summary of Compensation for Key Management Personnel (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Number and average number of employees [abstract]
Short-term employee benefits	£ 28.1	£ 29.7	£ 28.0
Pensions and other post-retirement benefits	1.3	1.1	0.9
Share-based payments	30.1	29.8	14.6
Key management personnel compensation	£ 59.5	£ 60.6	£ 43.5

X

- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

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X

- Definition

The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

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- Definition

The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

+ References

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- Definition

The amount of compensation to key management personnel in the form of short-term employee benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

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