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Costs of services and general and administrative costs - Summary of Operating Costs (Details) - GBP (£)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Analysis of income and expense [abstract]      
Costs of services £ 12,325,800,000 £ 11,890,100,000 £ 10,597,500,000
General and administrative costs 1,988,000,000 1,180,400,000 974,600,000
Costs of services and general and administrative costs 14,313,800,000 13,070,500,000 11,572,100,000
Costs of services and general and administrative costs include:      
Staff costs (note 5) 8,137,600,000 8,165,800,000 7,166,700,000
Establishment costs 515,800,000 536,000,000.0 529,000,000.0
Media pass-through costs 2,173,600,000 1,905,700,000 1,865,300,000
Other costs of services and general and administrative costs 3,486,800,000 2,463,000,000 2,011,100,000
Goodwill impairment (note 13) 63,600,000 37,900,000 1,800,000
Amortisation and impairment of acquired intangible assets 727,900,000 62,100,000 97,800,000
Investment and other impairment charges/(reversals) 17,800,000 77,000,000.0 (42,400,000)
Restructuring and transformation costs 195,500,000 218,800,000 175,400,000
Property-related restructuring costs 232,500,000 18,000,000 0
(Gains)/losses on disposal of investments and subsidiaries (7,100,000) 36,300,000 10,600,000
Gains on remeasurement of equity interests arising from a change in scope of ownership 0 (66,500,000) 0
Litigation settlement (11,000,000.0) 0 21,300,000
Amortisation of other intangible assets 24,800,000 21,900,000 19,900,000
Depreciation of property, plant and equipment 165,100,000 166,900,000 151,200,000
Depreciation of right-of-use assets 256,800,000 262,200,000 272,900,000
Losses/(gains) on sale of property, plant and equipment 400,000 (6,400,000) (1,300,000)
Foreign exchange (14,500,000) (8,700,000) 4,400,000
Short-term lease expense 22,200,000 20,200,000 18,000,000.0
Low-value lease expense 2,800,000 1,900,000 2,300,000
Other pass-through costs £ 811,500,000 £ 723,700,000 £ 538,600,000