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Property, plant and equipment - Summary of Property, Plant and Equipment (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance £ 979.5 [1] £ 968.7  
Charge for the year 225.1 230.7 £ 215.2
Ending balance 1,083.0 979.5 [1] 968.7
Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 2,317.9 2,322.0  
Additions 314.8 288.9  
New acquisitions 3.1 5.5  
Disposals (255.7) (142.6)  
Exchange adjustments 60.6 (155.9)  
Ending balance 2,440.7 2,317.9 2,322.0
Depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 1,338.4 1,353.3  
Charge for the year 225.1 230.7  
Disposals (240.5) (134.8)  
Exchange adjustments 34.7 (110.8)  
Ending balance 1,357.7 1,338.4 1,353.3
Land [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 37.1 37.1  
Ending balance 37.1 37.1 37.1
Land [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 37.1 37.1  
Ending balance 37.1 37.1 37.1
Freehold buildings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 90.3 101.2  
Ending balance 108.4 90.3 101.2
Freehold buildings [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 118.8 126.4  
Additions 17.7 4.3  
New acquisitions 0.1    
Disposals   (1.2)  
Exchange adjustments (1.1) (10.7)  
Ending balance 135.5 118.8 126.4
Freehold buildings [member] | Depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 28.5 25.2  
Charge for the year 3.1 6.9  
Disposals   (1.9)  
Exchange adjustments (4.5) (1.7)  
Ending balance 27.1 28.5 25.2
Leasehold buildings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 555.7 502.7  
Ending balance 635.1 555.7 502.7
Leasehold buildings [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 1,081.8 1,012.5  
Additions 161.4 165.0  
New acquisitions 0.9 2.0  
Disposals (83.5) (46.1)  
Exchange adjustments 41.8 (51.6)  
Ending balance 1,202.4 1,081.8 1,012.5
Leasehold buildings [member] | Depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 526.1 509.8  
Charge for the year 91.5 86.7  
Disposals (74.6) (42.6)  
Exchange adjustments 24.3 (27.8)  
Ending balance 567.3 526.1 509.8
Fixtures, fittings and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 140.3 162.6  
Ending balance 145.6 140.3 162.6
Fixtures, fittings and equipment [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 377.2 402.6  
Additions 49.9 31.7  
New acquisitions 1.2 2.4  
Disposals (62.9) (40.7)  
Exchange adjustments 9.9 (18.8)  
Ending balance 375.3 377.2 402.6
Fixtures, fittings and equipment [member] | Depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 236.9 240.0  
Charge for the year 44.4 47.0  
Disposals (58.0) (35.9)  
Exchange adjustments 6.4 (14.2)  
Ending balance 229.7 236.9 240.0
Computer equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 156.1 165.1  
Ending balance 156.8 156.1 165.1
Computer equipment [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 703.0 743.4  
Additions 85.8 87.9  
New acquisitions 0.9 1.1  
Disposals (109.3) (54.6)  
Exchange adjustments 10.0 (74.8)  
Ending balance 690.4 703.0 743.4
Computer equipment [member] | Depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 546.9 578.3  
Charge for the year 86.1 90.1  
Disposals (107.9) (54.4)  
Exchange adjustments 8.5 (67.1)  
Ending balance £ 533.6 £ 546.9 £ 578.3
[1] Prior year figures have been restated for the impact of the adoption of IFRS 15 Revenue from Contracts with Customers, as described in the accounting policies.