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Reconciliation of profit before taxation to headline operating profit - Summary of Reconciliation of Operating Profit to Headline Operating Profit (Details) - GBP (£)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of reconciliation of profit before interest and taxation to headline PBIT [abstract]      
Profit before taxation £ 346,300,000 £ 1,159,800,000 £ 950,800,000
Finance and investment income (127,300,000) (145,400,000) (69,400,000)
Finance costs 389,000,000.0 359,400,000 283,600,000
Revaluation and retranslation of financial instruments (6,800,000) (76,000,000.0) 87,800,000
Profit before interest and taxation 601,200,000 1,297,800,000 1,252,800,000
(Earnings)/loss from associates - after interest and tax (70,200,000) 60,400,000 (23,800,000)
Operating profit 531,000,000.0 1,358,200,000 1,229,000,000
Goodwill impairment 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    
(Gains)/losses on disposal of investments and subsidiaries   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)
Headline operating profit £ 1,750,200,000 £ 1,741,800,000 £ 1,493,500,000