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Property, plant and equipment - Summary of Property, Plant and Equipment (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance £ 1,083.0 £ 979.5  
Depreciation of property, plant and equipment 185.5 188.6 £ 189.0
Ending balance 876.0 1,083.0 979.5
Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 2,440.7 2,317.9  
Additions 294.9 314.8  
New acquisitions 0.1 3.1  
Disposals (420.9) (255.7)  
Transfer to disposal group classified as held for sale (464.7)    
Exchange adjustments (104.5) 60.6  
Ending balance 1,745.6 2,440.7 2,317.9
Depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 1,357.7 1,338.4  
Depreciation of property, plant and equipment 185.5 225.1  
Disposals (271.5) (240.5)  
Transfer to disposal group classified as held for sale (346.0)    
Exchange adjustments (56.1) 34.7  
Ending balance 869.6 1,357.7 1,338.4
Land [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 37.1 37.1  
Ending balance 34.3 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  
Transfer to disposal group classified as held for sale (2.8)    
Ending balance 34.3 37.1 37.1
Freehold buildings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 108.4 90.3  
Ending balance 22.0 108.4 90.3
Freehold buildings [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 135.5 118.8  
Additions 33.7 17.7  
New acquisitions   0.1  
Disposals (109.0)    
Transfer to disposal group classified as held for sale (17.1)    
Exchange adjustments (16.9) (1.1)  
Ending balance 26.2 135.5 118.8
Freehold buildings [member] | Depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 27.1 28.5  
Depreciation of property, plant and equipment 1.5 3.1  
Disposals (7.2)    
Transfer to disposal group classified as held for sale (15.6)    
Exchange adjustments (1.6) (4.5)  
Ending balance 4.2 27.1 28.5
Leasehold buildings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 635.1 555.7  
Ending balance 605.5 635.1 555.7
Leasehold buildings [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 1,202.4 1,081.8  
Additions 158.5 161.4  
New acquisitions   0.9  
Disposals (167.3) (83.5)  
Transfer to disposal group classified as held for sale (98.1)    
Exchange adjustments (46.7) 41.8  
Ending balance 1,048.8 1,202.4 1,081.8
Leasehold buildings [member] | Depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 567.3 526.1  
Depreciation of property, plant and equipment 79.9 91.5  
Disposals (129.9) (74.6)  
Transfer to disposal group classified as held for sale (56.1)    
Exchange adjustments (17.9) 24.3  
Ending balance 443.3 567.3 526.1
Fixtures, fittings and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 145.6 140.3  
Ending balance 101.2 145.6 140.3
Fixtures, fittings and equipment [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 375.3 377.2  
Additions 35.0 49.9  
New acquisitions 0.1 1.2  
Disposals (68.3) (62.9)  
Transfer to disposal group classified as held for sale (115.2)    
Exchange adjustments (14.5) 9.9  
Ending balance 212.4 375.3 377.2
Fixtures, fittings and equipment [member] | Depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 229.7 236.9  
Depreciation of property, plant and equipment 36.3 44.4  
Disposals (59.9) (58.0)  
Transfer to disposal group classified as held for sale (81.7)    
Exchange adjustments (13.2) 6.4  
Ending balance 111.2 229.7 236.9
Computer equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 156.8 156.1  
Ending balance 113.0 156.8 156.1
Computer equipment [member] | Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 690.4 703.0  
Additions 67.7 85.8  
New acquisitions   0.9  
Disposals (76.3) (109.3)  
Transfer to disposal group classified as held for sale (231.5)    
Exchange adjustments (26.4) 10.0  
Ending balance 423.9 690.4 703.0
Computer equipment [member] | Depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning balance 533.6 546.9  
Depreciation of property, plant and equipment 67.8 86.1  
Disposals (74.5) (107.9)  
Transfer to disposal group classified as held for sale (192.6)    
Exchange adjustments (23.4) 8.5  
Ending balance £ 310.9 £ 533.6 £ 546.9