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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] £ 1,083.0 £ 979.5  
Depreciation of property, plant and equipment 185.5 188.6 £ 189.0
Ending balance [1] 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)
[1] Figures have been restated, as described in the accounting policies.