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Costs of services and general and administrative costs - Additional Information (Details) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Information About Operating Cost [line items] |  |  |
Adjustments for amortisation and impairment of acquired intangible assets continue operation | £ 93.0 | £ 728.0 | £ 62.0
Other impairment charges | 26.0 | 18.0 | 77.0
Impairments related to capitalized configuration and customization costs |  |  | 29.0
Restructuring and transformation costs | 251.0 | 196.0 | 219.0
Restructuring and transformation costs, IT Transformation Program | 90.0 | 113.0 | 134.0
Restructuring and transformation costs in relation to the continuing restructuring plan | 144.0 | 73.0 | 70.0
Property-related restructuring costs | 26.0 | 232.0 | 18.0
Impairments loss recognized in property related costs | 23.0 | 0.0 | 0.0
Impairment loss, right of use assets | 1.0 | 129.0 | 18.0
Impairment charges included within restructuring costs | 2.0 | 56.0 | 0.0
Gains (losses) on disposals of investments | 322.0 | 7.0 | (36.0)
Legal provision charges/(gains) | 68.0 | (11.0) | 0.0
Amortisation and impairment |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |
Charge for the year | 125.0 | 753.0 |
FGS Global |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |
Gains (losses) on disposals of investments | 275.0 |  |
ERP System |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |
Restructuring and transformation costs | 56.0 | 52.0 | 97.0
Transformation Costs |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |
Restructuring and transformation costs | 29.0 | 38.0 | 0.0
Covid-19 Pandemic |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |
Restructuring costs due to covid nineteen pandemic | 17.0 | 10.0 | 15.0
Brand names |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |
Impairment loss recognised in profit or loss, intangible assets other than goodwill | 21.0 | 650.0 | 1.0
Brand Names No Longer In Use |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |
Impairment loss recognised in profit or loss, intangible assets other than goodwill |  | 650.0 | £ 1.0
Brand Names No Longer In Use | Burson |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |
Impairment loss recognised in profit or loss, intangible assets other than goodwill | 20.0 |  |
Acquired intangibles | Amortisation and impairment |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |
Charge for the year | £ 93.0 | £ 728.0 |

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