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Provisions for liabilities and charges - Summary of Provisions for Liabilities and Charges (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of Noncurrent Provisions [line items]    
Beginning balance £ 244.6 £ 268.5
Charged to the income statement 92.2 14.5
Acquisitions 0.6 1.3
Utilised (41.2) (50.0)
Released to the income statement (14.8) (25.4)
Other movements 35.0 13.0
Exchange adjustments (11.9) 22.7
Ending balance 304.5 244.6
Acquisitions provisions from revisions to fair value adjustments 0.6 1.3
Employee benefits    
Disclosure of Noncurrent Provisions [line items]    
Beginning balance 143.1 140.3
Charged to the income statement 3.1 4.3
Acquisitions 0.0 0.0
Utilised (21.8) (32.5)
Released to the income statement (2.3) 0.0
Other movements 38.1 14.6
Exchange adjustments (7.4) 16.4
Ending balance 152.8 143.1
Property    
Disclosure of Noncurrent Provisions [line items]    
Beginning balance 62.8 70.6
Charged to the income statement 64.2 8.1
Acquisitions 0.0 0.0
Utilised (18.7) (12.8)
Released to the income statement (4.0) (3.2)
Other movements (2.9) (4.8)
Exchange adjustments (2.7) 4.9
Ending balance 98.7 62.8
Other    
Disclosure of Noncurrent Provisions [line items]    
Beginning balance 38.7 57.6
Charged to the income statement 24.9 2.1
Acquisitions 0.6 1.3
Utilised (0.7) (4.7)
Released to the income statement (8.5) (22.2)
Other movements (0.2) 3.2
Exchange adjustments (1.8) 1.4
Ending balance £ 53.0 £ 38.7