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Analysis of cash flows - Summary of Analysis of Cash Flows (Details)
£ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
GBP (£)
Dec. 31, 2022
GBP (£)
Dec. 31, 2021
GBP (£)
Dec. 31, 2023
USD ($)
Disclosure Of Cash Flow Statement [line items]        
Profit for the year £ 197.2 £ 775.4 £ 720.7  
Taxation 149.1 384.4 230.1  
Revaluation and retranslation of financial instruments (6.8) (76.0) 87.8  
Finance costs 389.0 359.4 283.6  
Finance and investment income (127.3) (145.4) (69.4)  
Earnings/(loss) from associates - after interest and tax (70.2) 60.4 (23.8)  
Non-cash share-based incentive plans (including share options) 140.1 122.0 99.6  
Depreciation of property, plant and equipment 165.1 166.9 151.2  
Depreciation of right-of-use assets 256.8 262.2 272.9  
Impairment charges included within restructuring costs 184.6 43.3 39.2  
Goodwill impairment 63.6 37.9 1.8  
Amortisation and impairment of acquired intangible assets 727.9 62.1 97.8  
Amortisation of other intangible assets 24.8 21.9 19.9  
Investment and other impairment charges/(reversals) 17.8 77.0 (42.4)  
(Gains)/losses on disposal of investments and subsidiaries (7.1) 36.3 10.6  
Gains on remeasurement of equity interests arising from a change in scope of ownership 0.0 (66.5) 0.0  
Losses/(gains) of sale of property, plant and equipment 0.4 (6.4) (1.3)  
Decrease/(increase) in trade receivables and accrued income 231.8 (498.6) (458.9)  
(Decrease)/increase in trade payables and deferred income (238.0) 170.6 777.8  
Decrease/(increase) in other receivables 125.0 (154.1) (120.0)  
(Decrease)/increase in other payables - short-term (563.5) (259.6) 547.0  
Increase/(decrease) in other payables - long-term 118.8 (67.0) (11.0)  
Increase/(decrease) in provisions 65.7 (38.0) (32.9)  
Corporation and overseas tax paid (395.3) (390.9) (391.1)  
Payment on early settlement of bonds 0.0 0.0 (13.0)  
Interest expense related to lease liabilities (102.9) (92.4) (88.4)  
Other interest and similar charges paid (274.5) (210.2) (173.7)  
Interest received 115.8 88.9 47.5  
Investment income 12.9 24.5 17.8  
Dividends from associates 43.4 37.6 53.4  
Earnout payments recognised in operating activities (6.0) (24.8) (3.8)  
Net cash inflow from operating activities [1] 1,238.2 700.9 2,029.0  
Acquisitions and disposals:        
Net cash inflow from operating activities (227.0) (218.3) (227.6)  
Cash and cash equivalents acquired 22.5 38.8 (2.3)  
Earnout payments recognised in investing activities (52.5) (46.6) (53.2)  
Purchase of other investments (including associates) (9.8) (10.1) (99.2)  
Acquisitions [1] (266.8) (236.2) (382.3)  
Proceeds on disposal of investments and subsidiaries 99.5 50.1 51.9  
Cash and cash equivalents disposed (0.7) (12.4) (23.6)  
Disposals of investments and subsidiaries 98.8 37.7 28.3  
Cash consideration received from non-controlling interests 46.1 0.0 39.5  
Cash consideration for purchase of non-controlling interests (16.4) (84.2) (135.0)  
Cash consideration for purchase of non-controlling interests 29.7 (84.2) (95.5)  
Net acquisition payments and disposal proceeds (138.3) (282.7) (449.5)  
Share repurchases and buybacks:        
Purchase of own shares by ESOP Trusts (53.9) (55.3) (89.2)  
Shares purchased into treasury for cancellation 0.0 (807.4) (729.3)  
Share repurchases and buybacks (53.9) (862.7) (818.5)  
Proceeds from issue of bonds:        
Proceeds from issue of bonds 1,052.6 0.0 0.0  
Drawdown from revolving credit facility 400.0 0.0 0.0  
Repayment of borrowings:        
Decrease in drawings on bank loans 0.0 (11.3) (36.3)  
Repayment of borrowing-related derivatives (46.0) 0.0 0.0  
Repayment of revolving credit facility (400.0) 0.0 0.0  
Net repayment of debt assumed on acquisition (48.9) 0.0 0.0  
Net cash outflow 1,147.5 220.6 397.1  
Cash and cash equivalents:        
Cash at bank and in hand 2,036.8 2,271.6 2,776.6  
Short-term bank deposits 180.7 219.9 1,106.3  
Overdrafts (358.2) (505.7) (342.3)  
Cash and cash equivalents excluding disposal group 1,859.3 1,985.8 3,540.6  
Proceeds from issue of €750 million bonds        
Proceeds from issue of bonds:        
Bond amount 750.0      
Proceeds from issue of bonds 652.6 0.0 0.0  
Repayment of borrowings:        
Bond amount 750.0      
Repayment of €750 million bonds        
Proceeds from issue of bonds:        
Bond amount 750.0      
Repayment of borrowings:        
Bond amount 750.0      
Repayment of bonds (652.6) 0.0 0.0  
Repayment of $500000000 million bonds        
Proceeds from issue of bonds:        
Bond amount | $       $ 500
Repayment of borrowings:        
Bond amount | $       $ 500
Repayment of bonds 0.0 0.0 (360.8)  
Repayment of €250 million bonds        
Proceeds from issue of bonds:        
Bond amount 250.0      
Repayment of borrowings:        
Bond amount 250.0      
Repayment of bonds £ 0.0 £ (209.3) £ 0.0  
[1] Earnout payments in excess of the amount determined at acquisition are recorded as operating activities.