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Other intangible assets - Movements of Other Intangible Assets (Detail) - GBP (£)
£ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Disclosure of detailed information about intangible assets [line items]      
Other intangibles £ 1,936.7 £ 2,018.4 [1] £ 2,111.3 [1]
Brands with an indefinite useful life [member]      
Disclosure of detailed information about intangible assets [line items]      
Other intangibles 1,086.7 1,081.3 1,108.7
Acquired intangibles [member]      
Disclosure of detailed information about intangible assets [line items]      
Other intangibles 747.5 829.1 896.6
Other [member]      
Disclosure of detailed information about intangible assets [line items]      
Other intangibles £ 102.5 £ 108.0 £ 106.0
[1] Prior year figures have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers, as described in note 2.