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Intangible assets - Movements of Other Intangible Assets (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]      
Beginning balance [1] £ 1,842.0 £ 2,018.4  
Charge for the year 26.5 89.1 £ 6.0
Ending balance [1] 1,468.8 1,842.0 2,018.4
Cost [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 4,180.1 4,040.6  
Additions 43.2 60.4  
Disposals (44.4) (38.2)  
New acquisitions 3.5 40.3  
Other movements (1.4) (4.5) [2]  
Exchange adjustments (79.5) 81.5  
Transfer to disposal group classified as held for sale (1,094.9)    
Ending balance 3,006.6 4,180.1 4,040.6
Amortisation and impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 2,338.1 2,022.2  
Charge for the year 159.6 314.5  
Disposals (39.3) (28.0)  
Other movements 2.6 (1.9)  
Exchange adjustments (24.3) 31.3  
Transfer to disposal group classified as held for sale (898.9)    
Ending balance 1,537.8 2,338.1 2,022.2
Brands with an indefinite useful life [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 1,132.8 1,081.3  
Ending balance 1,078.2 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 1,132.8 1,081.3  
Exchange adjustments (41.4) 51.5  
Ending balance 1,091.4 1,132.8 1,081.3
Brands with an indefinite useful life [member] | Amortisation and impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Charge for the year 13.2    
Ending balance 13.2    
Acquired intangibles [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 594.8 829.1  
Ending balance 323.6 594.8 829.1
Acquired intangibles [member] | Cost [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 2,610.0 2,547.8  
Disposals (3.4) (0.9)  
New acquisitions 3.5 40.3  
Other movements [2]   2.9  
Exchange adjustments (28.2) 19.9  
Transfer to disposal group classified as held for sale (979.0)    
Ending balance 1,602.9 2,610.0 2,547.8
Acquired intangibles [member] | Amortisation and impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 2,015.2 1,718.7  
Charge for the year 116.8 275.8  
Disposals (1.6) (0.7)  
Exchange adjustments (15.2) 21.4  
Transfer to disposal group classified as held for sale (835.9)    
Ending balance 1,279.3 2,015.2 1,718.7
Other [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 114.4 108.0  
Ending balance 67.0 114.4 108.0
Other [member] | Cost [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 437.3 411.5  
Additions 43.2 60.4  
Disposals (41.0) (37.3)  
Other movements (1.4) (7.4) [2]  
Exchange adjustments (9.9) 10.1  
Transfer to disposal group classified as held for sale (115.9)    
Ending balance 312.3 437.3 411.5
Other [member] | Amortisation and impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 322.9 303.5  
Charge for the year 29.6 38.7  
Disposals (37.7) (27.3)  
Other movements 2.6 (1.9)  
Exchange adjustments (9.1) 9.9  
Transfer to disposal group classified as held for sale (63.0)    
Ending balance £ 245.3 £ 322.9 £ 303.5
[1] Figures have been restated, as described in the accounting policies.
[2] Other movements in acquired intangibles include revisions to fair value adjustments arising on the acquisition of subsidiary undertakings that had been determined provisionally at the immediately preceding balance sheet date, as permitted by IFRS 3 Business Combinations.