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Finance and investment income, finance costs and revaluation and retranslation of financial instruments (Detail) - GBP (£) £ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Finance and investment income, finance costs and revaluation and retranslation of financial instruments [Abstract]
Income from equity investments	£ 3.4	£ 20.1
Interest income	99.0	35.4
Finance income	102.4	55.5
Interest payable and similar charges1	180.2	98.9
Interest expense related to lease liabilities	50.5	46.0
Finance costs	230.7	144.9
Movements in fair value of treasury instruments	4.4	1.9
Revaluation of investments held at fair value through profit or loss	(24.2)	9.0
Revaluation of put options over non-controlling interests	7.1	19.6
Revaluation of payments due to vendors (earnout agreements)	25.7	(1.1)
Retranslation of financial instruments	12.5	3.7
Revaluation and retranslation of financial instruments	£ 25.5	£ 33.1

X

- Definition

The amount of costs associated with financing activities of the entity.

+ References

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- Definition

The amount of income associated with interest and other financing activities of the entity.

+ References

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- Definition

The amount of interest expense on borrowings. [Refer: Interest expense; Borrowings]

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- Definition

The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

+ References

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- Definition

The amount of interest income on debt instruments held. [Refer: Interest income; Debt instruments held]

+ References

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- Definition

The amount of investment income, such as interest and dividends.

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Finance and investment income, finance costs and revaluation and retranslation of financial instruments

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Gains losses in fair value of treasury instruments.

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- Definition

Gains (losses) on financial instruments.

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Revaluation and retranslation of financial instruments.

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- Definition

Revaluation of investments held at fair value through profit or loss.

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No definition available.

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- Definition

Revaluation of earnout payments due to vendors.

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No definition available.

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- Definition

Revaluation of put options over noncontrolling interest.

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