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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2023
Disclosure Of Intangible Assets And Goodwill [Abstract]  
Movements of Goodwill
The movements in 2023 and 2022 were as follows:
£m
Cost
1 January 202210,991.0 
Additions1
262.6 
Disposals— 
Exchange adjustments891.0 
31 December 202212,144.6 
Additions1
319.1 
Disposals— 
Exchange adjustments(484.5)
31 December 202311,979.2 
Accumulated impairment losses and write-downs
1 January 20223,378.7 
Impairment losses for the year37.9 
Exchange adjustments274.6 
31 December 20223,691.2 
Impairment losses for the year63.6 
Exchange adjustments(164.5)
31 December 20233,590.3 
Net book value
31 December 20238,388.9 
31 December 20228,453.4 
1 January 20227,612.3 
Note
1Additions represent goodwill arising on the acquisition of subsidiary undertakings including the effect of any revisions to fair value adjustments that had been determined provisionally at the immediately preceding balance sheet date, as permitted by IFRS 3 Business Combinations. The effect of such revisions was not material in either year presented.
Movements of Other Intangible Assets
The movements in 2023 and 2022 were as follows:
Brands
with an
indefinite
useful life		Acquired
intangibles		OtherTotal
£m£m£m£m
Cost
1 January 20221
1,067.3 921.4 288.1 2,276.8 
Additions— — 14.9 14.9 
Disposals and derecognition1
— (33.8)(59.2)(93.0)
New acquisitions— 46.5 1.2 47.7 
Other movements2
— 9.3 0.8 10.1 
Exchange adjustments1
98.7 129.8 34.7 263.2 
31 December 20221
1,166.0 1,073.2 280.5 2,519.7 
Additions— — 40.0 40.0 
Disposals and derecognition
— (15.1)(51.8)(66.9)
Reclassifications
(665.4)665.4 — — 
New acquisitions— 138.5 2.9 141.4 
Other movements2
— — 17.0 17.0 
Exchange adjustments
(28.4)(47.5)(9.4)(85.3)
31 December 2023472.2 1,814.5 279.2 2,565.9 
Amortisation and impairment
1 January 20221
56.8 648.0 212.5 917.3 
Charge for the year— 61.9 21.9 83.8 
Impairment charges included within restructuring costs3
— — 29.0 29.0 
Disposals and derecognition1
— (33.6)(59.4)(93.0)
Exchange adjustments1
5.8 108.2 16.7 130.7 
31 December 20221
62.6 784.5 220.7 1,067.8 
Charge for the year— 727.9 24.8 752.7 
Other movements2
— — (0.7)(0.7)
Disposals and derecognition
— (15.1)(51.5)(66.6)
Exchange adjustments
(2.8)(27.0)(7.4)(37.2)
31 December 202359.8 1,470.3 185.9 1,716.0 
Net book value
31 December 2023412.4 344.2 93.3 849.9 
31 December 20221,103.4 288.7 59.8 1,451.9 
1 January 20221,010.5 273.4 75.6 1,359.5 
Notes
1The acquired intangibles balances within these line items have been re-presented to reflect the derecognition of previously fully amortised assets that had no future economic benefit in prior periods.
2Other movements in acquired intangibles include reclassifications of items previously recorded in trade and other receivables; and revisions to fair value adjustments arising on the acquisition of subsidiary undertakings that had been determined provisionally at the immediately preceding balance sheet date, as permitted by IFRS 3 Business Combinations.
3Refer to note 3 for further explanation in relation to the impairment charges included within restructuring costs.
Cash-generating Units with Significant Goodwill
Cash-generating units (CGUs) with significant goodwill and brands with an indefinite useful life as at 31 December are:
Goodwill
Brands with an indefinite useful life
2023202220232022
£m£m£m£m
GroupM3,254.9 3,178.3 — — 
Wunderman Thompson1,165.0 1,210.8 — 442.0 
VMLY&R
814.6 776.0 — 207.6 
Ogilvy809.3 849.8 213.2 222.8 
BCW
618.8 646.0 112.7 140.5 
AKQA Group
600.1 628.7 — — 
FGS Global452.1 451.8 — — 
Hill & Knowlton
141.7 145.7 33.2 34.8 
Landor Group
115.0 106.5 53.3 55.7 
Other417.4 459.8 — — 
8,388.9 8,453.4 412.4 1,103.4