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Costs of services and general and administrative costs - Additional Information (Detail) - GBP (£) £ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022
Disclosure Of Information About Operating Cost [line items] |  |
Amortisation and impairment of acquired intangible assets | £ 36.6 | £ 31.5
Goodwill impairment | 52.9 | 0.0
Investment and other impairment charges | 11.0 | 0.0
Losses on disposal of investments and subsidiaries | 2.9 | 48.1
Gains on remeasurement of equity interests arising from a change in scope of ownership | 0.0 | 60.4
Restructuring and transformation costs in relation to the continuing restructuring plan | 86.8 | 81.2
Capitalised costs | 23.8 | 46.3
Restructuring and transformation costs | 86.8 | 81.2
Restructuring costs in relation to COVID-19 | 180.0 | 0.0
Transformation costs | 25.9 | 15.8
ERP System |  |
Disclosure Of Information About Operating Cost [line items] |  |
Restructuring and transformation costs | 15.2 | 0.0
Covid19 Pandemic |  |
Disclosure Of Information About Operating Cost [line items] |  |
Restructuring costs in relation to COVID-19 | 7.0 | 5.9
Russian Interest |  |
Disclosure Of Information About Operating Cost [line items] |  |
Losses on disposals of investments |  | 65.1
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 | 1.7 | 1.3
Investor Day |  |
Disclosure Of Information About Operating Cost [line items] |  |
Restructuring and transformation costs in relation to the continuing restructuring plan | £ 53.9 | £ 59.5

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