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Other reserves - Summary of Other Reserves (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of reserves within equity [line items]      
Beginning balance £ 4,160.4 £ 4,069.0 £ 5,050.1
Foreign exchange differences on translation of foreign operations (427.1) 424.2 (143.0)
Gain/(loss) on net investment hedges 108.2 (141.5) 45.5
Fair value loss arising on hedging instruments (43.3) 38.5 (38.0)
Less: gain/(loss) reclassified to profit or loss 44.2 (38.5) 38.0
Share of other comprehensive (loss)/ earnings of associate undertakings (0.9) 51.2 13.5
Share cancellations   (807.4) (729.3)
Recognition and remeasurement of financial instruments 227.7 61.4 (241.6)
Ending balance 3,832.7 4,160.4 4,069.0
Other reserves      
Disclosure of reserves within equity [line items]      
Beginning balance 285.2 (335.9) 191.2
Foreign exchange differences on translation of foreign operations (404.0) 409.0 (132.7)
Gain/(loss) on net investment hedges 108.2 (141.5) 45.5
Fair value loss arising on hedging instruments (43.3) 38.5 (38.0)
Less: gain/(loss) reclassified to profit or loss 44.2 (38.5) 38.0
Share of other comprehensive (loss)/ earnings of associate undertakings (0.9) 31.9 7.3
Share cancellations   8.3 7.2
Recognition and remeasurement of financial instruments 197.2 101.7 (242.7)
Shares purchased into treasury for cancellation   211.7 (211.7)
Ending balance 186.6 285.2 (335.9)
Capital redemption reserve      
Disclosure of reserves within equity [line items]      
Beginning balance 21.9 13.6 6.4
Share cancellations   8.3 7.2
Ending balance 21.9 21.9 13.6
Equity reserve      
Disclosure of reserves within equity [line items]      
Beginning balance (263.3) (576.7) (122.3)
Recognition and remeasurement of financial instruments 197.2 101.7 (242.7)
Shares purchased into treasury for cancellation   211.7 (211.7)
Ending balance (66.1) (263.3) (576.7)
Hedging reserve      
Disclosure of reserves within equity [line items]      
Beginning balance   0.0 0.0
Fair value loss arising on hedging instruments (43.3) 38.5 (38.0)
Less: gain/(loss) reclassified to profit or loss 44.2 (38.5) 38.0
Ending balance 0.9   0.0
Translation reserve      
Disclosure of reserves within equity [line items]      
Beginning balance 526.6 227.2 307.1
Foreign exchange differences on translation of foreign operations (404.0) 409.0 (132.7)
Gain/(loss) on net investment hedges   (141.5) 45.5
Share of other comprehensive (loss)/ earnings of associate undertakings (0.9) 31.9 7.3
Ending balance £ 229.9 £ 526.6 £ 227.2