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Intangible assets - Movements of Other Intangible Assets (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]    
Beginning balance £ 2,018.4 [1] £ 2,217.3
Charge for the year 126.1 6.0
Ending balance 1,842.0 2,018.4 [1]
Cost [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 4,040.6 4,080.9
Additions 60.4 37.3
Disposals (38.2) (15.8)
New acquisitions 40.3 79.8
Other movements (4.5) 13.6
Exchange adjustments 81.5 (155.2)
Ending balance 4,180.1 4,040.6
Amortisation and impairment [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 2,022.2 1,863.6
Charge for the year 314.5 225.7
Disposals (28.0) (14.9)
Other movements (1.9) 2.5
Exchange adjustments 31.3 (54.7)
Ending balance 2,338.1 2,022.2
Brands with an indefinite useful life [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 1,081.3 1,141.3
Ending balance 1,132.8 1,081.3
Brands with an indefinite useful life [member] | Cost [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 1,081.3 1,141.3
Exchange adjustments 51.5 (60.0)
Ending balance 1,132.8 1,081.3
Acquired intangibles [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 829.1 972.5
Ending balance 594.8 829.1
Acquired intangibles [member] | Cost [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 2,547.8 2,535.5
Disposals (0.9)  
New acquisitions 40.3 79.0
Other movements 2.9 6.4
Exchange adjustments 19.9 (73.1)
Ending balance 2,610.0 2,547.8
Acquired intangibles [member] | Amortisation and impairment [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 1,718.7 1,563.0
Charge for the year 275.8 189.4
Disposals (0.7)  
Exchange adjustments 21.4 (33.7)
Ending balance 2,015.2 1,718.7
Other [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 108.0 103.5
Ending balance 114.4 108.0
Other [member] | Cost [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 411.5 404.1
Additions 60.4 37.3
Disposals (37.3) (15.8)
New acquisitions   0.8
Other movements (7.4) 7.2
Exchange adjustments 10.1 (22.1)
Ending balance 437.3 411.5
Other [member] | Amortisation and impairment [member]    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 303.5 300.6
Charge for the year 38.7 36.3
Disposals (27.3) (14.9)
Other movements (1.9) 2.5
Exchange adjustments 9.9 (21.0)
Ending balance £ 322.9 £ 303.5
[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.