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Property, plant and equipment - Summary of Property, Plant and Equipment (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance £ 1,000.7 £ 896.4  
Charge for the year 165.1 166.9 £ 151.2
Impairment charges included within restructuring costs 55.8    
Ending balance 828.5 1,000.7 896.4
Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 1,922.9 1,720.9  
Additions 177.2 208.4  
New acquisitions 0.8 1.3  
Disposals (302.5) (182.6)  
Exchange adjustments 181.9 (174.9)  
Ending balance 1,616.5 1,922.9 1,720.9
Depreciation and impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (922.2) (824.5)  
Charge for the year 165.1 166.9  
Impairment charges included within restructuring costs 55.8 9.8  
Disposals 287.6 173.0  
Exchange adjustments (67.5) 94.0  
Ending balance (788.0) (922.2) (824.5)
Land      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 40.0 43.2  
Ending balance 11.9 40.0 43.2
Land | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 40.0 43.2  
Additions 3.5 13.8  
New acquisitions 0.0 0.0  
Disposals 0.0 (0.1)  
Exchange adjustments 31.6 16.9  
Ending balance 11.9 40.0 43.2
Land | Depreciation and impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 0.0 0.0  
Charge for the year 0.0 0.0  
Impairment charges included within restructuring costs 0.0 0.0  
Disposals 0.0 0.0  
Exchange adjustments 0.0 0.0  
Ending balance 0.0 0.0 0.0
Freehold buildings      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 90.5 58.7  
Ending balance 31.7 90.5 58.7
Freehold buildings | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 92.5 61.4  
Additions 3.3 0.1  
New acquisitions 0.0 0.0  
Disposals 0.0 (8.3)  
Exchange adjustments 61.5 (39.3)  
Ending balance 34.3 92.5 61.4
Freehold buildings | Depreciation and impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (2.0) (2.7)  
Charge for the year 1.0 0.7  
Impairment charges included within restructuring costs 0.0 0.0  
Disposals 0.2 1.7  
Exchange adjustments (0.2) 0.3  
Ending balance (2.6) (2.0) (2.7)
Leasehold buildings      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 646.5 605.4  
Ending balance 579.9 646.5 605.4
Leasehold buildings | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 1,178.9 1,075.0  
Additions 88.3 75.8  
New acquisitions 0.8 0.5  
Disposals (155.9) (62.1)  
Exchange adjustments 51.0 (89.7)  
Ending balance 1,061.1 1,178.9 1,075.0
Leasehold buildings | Depreciation and impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (532.4) (469.6)  
Charge for the year 70.5 74.0  
Impairment charges included within restructuring costs 52.2 9.1  
Disposals 144.9 63.5  
Exchange adjustments (29.0) 43.2  
Ending balance (481.2) (532.4) (469.6)
Fixtures, fittings and equipment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 85.0 77.6  
Ending balance 74.6 85.0 77.6
Fixtures, fittings and equipment | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 164.8 149.5  
Additions 17.1 32.1  
New acquisitions 0.0 0.2  
Disposals (51.0) (40.0)  
Exchange adjustments 11.5 (23.0)  
Ending balance 119.4 164.8 149.5
Fixtures, fittings and equipment | Depreciation and impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (79.8) (71.9)  
Charge for the year 24.9 26.5  
Impairment charges included within restructuring costs 2.7 0.6  
Disposals 48.4 36.7  
Exchange adjustments (14.2) 17.5  
Ending balance (44.8) (79.8) (71.9)
Computer equipment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 138.7 111.5  
Ending balance 130.4 138.7 111.5
Computer equipment | Cost      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance 446.7 391.8  
Additions 65.0 86.6  
New acquisitions 0.0 0.6  
Disposals (95.6) (72.1)  
Exchange adjustments 26.3 (39.8)  
Ending balance 389.8 446.7 391.8
Computer equipment | Depreciation and impairment      
Reconciliation of changes in property, plant and equipment [abstract]      
Beginning balance (308.0) (280.3)  
Charge for the year 68.7 65.7  
Impairment charges included within restructuring costs 0.9 0.1  
Disposals 94.1 71.1  
Exchange adjustments (24.1) 33.0  
Ending balance £ (259.4) £ (308.0) £ (280.3)