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Deferred tax - Movements of Gross Deferred Tax Liabilities (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance [1] £ 513.7  
Ending balance 479.5 £ 513.7 [1]
Gross deferred tax liabilities [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance 765.2 1,150.0
Acquisition of subsidiaries 10.7 21.4
(Credit)/charge to income (62.8) (53.9)
Impact of US tax reform   (296.2)
Charge to other comprehensive income 0.5 3.7
Exchange differences 24.9 (59.8)
Ending balance 738.5 765.2
Gross deferred tax liabilities [member] | Brands and other intangibles [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance 489.2 755.9
Acquisition of subsidiaries 10.7 21.4
(Credit)/charge to income (68.8) (49.9)
Impact of US tax reform   (203.8)
Exchange differences 7.5 (34.4)
Ending balance 438.6 489.2
Gross deferred tax liabilities [member] | Associate earnings [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance 21.6 28.3
(Credit)/charge to income (3.9) (6.0)
Exchange differences (0.1) (0.7)
Ending balance 17.6 21.6
Gross deferred tax liabilities [member] | Goodwill [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance 140.4 232.5
(Credit)/charge to income 31.8 0.7
Impact of US tax reform   (76.3)
Exchange differences 10.1 (16.5)
Ending balance 182.3 140.4
Gross deferred tax liabilities [member] | Property, plant and equipment [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance 21.2 36.2
(Credit)/charge to income (0.3) (0.5)
Impact of US tax reform   (11.9)
Exchange differences 1.3 (2.6)
Ending balance 22.2 21.2
Gross deferred tax liabilities [member] | Financial instruments [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance 36.2 64.0
(Credit)/charge to income (0.9) (3.3)
Impact of US tax reform   (22.2)
Exchange differences 4.6 (2.3)
Ending balance 39.9 36.2
Gross deferred tax liabilities [member] | Other temporary differences [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance 56.6 33.1
(Credit)/charge to income (20.7) 5.1
Impact of US tax reform   18.0
Charge to other comprehensive income 0.5 3.7
Exchange differences 1.5 (3.3)
Ending balance £ 37.9 £ 56.6
[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.