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Earnings/(loss) from associates - after interest and tax (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of associates [line items]      
Earnings/(loss) from associates - after interest and tax £ 70.2 £ (60.4) £ 23.8
Interests in associates and joint ventures 286.5 305.1 412.9
Restructuring and transformation costs 195.5 218.8 175.4
Kantar      
Disclosure of associates [line items]      
Interests in associates and joint ventures 0.0 0.0 61.2
Kantar      
Disclosure of associates [line items]      
Non-refundable distribution received £ 45.1    
Amortisation and impairment of acquired intangible assets other than goodwill   75.8 38.8
Restructuring and transformation costs   £ 54.8 £ 18.8