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Trade and other receivables - Summary of Trade and Other Receivables, Amounts Falling Due Within One Year (Details) - GBP (£) £ in Millions	Dec. 31, 2023	Dec. 31, 2022
Trade and other receivables [abstract]
Trade receivables (net of loss allowance)	£ 7,055.0	£ 7,403.9
Unbilled costs	273.6	352.4
VAT and sales taxes recoverable	370.7	448.1
Prepayments	239.0	236.6
Fair value of derivatives	1.6	5.1
Other debtors	520.7	585.3
Trade and other receivables	£ 8,460.6	£ 9,031.4

X

- Definition

The amount of current derivative financial assets. [Refer: Derivative financial assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2023-01-01
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X

- Definition

The amount of current prepayments. [Refer: Prepayments]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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X

- Definition

The amount of current receivables from contracts with customers. [Refer: Receivables from contracts with customers]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2023-01-01
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X

- Definition

The amount of current receivables from taxes other than income tax. [Refer: Receivables from taxes other than income tax]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
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- Definition

The amount of current other receivables. [Refer: Other receivables]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition

The amount of current trade receivables and current other receivables. [Refer: Current trade receivables; Other current receivables]

+ References

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- References

No definition available.

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- Definition

Outlays incurred on behalf of clients, including production costs, and other third-party costs that have not yet been billed and are considered receivables under IFRS 15.

+ References

No definition available.

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