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Other intangible assets - Disclosure of other intangilble asset (Detail) - GBP (£)
£ in Millions
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Disclosure of detailed information about intangible assets [line items]      
Other Intangible Assets [1],[2] £ 1,488.9 £ 1,468.8 £ 1,786.2
Brands with an indefinite useful life [member]      
Disclosure of detailed information about intangible assets [line items]      
Other Intangible Assets 1,129.8 1,078.2 1,141.2
Acquired intangibles [member]      
Disclosure of detailed information about intangible assets [line items]      
Other Intangible Assets 284.4 323.6 530.4
Other [member]      
Disclosure of detailed information about intangible assets [line items]      
Other Intangible Assets £ 74.7 £ 67.0 £ 114.6
[1] Figures have been restated to be in accordance with IAS 32 Financial Instruments: Presentation, as described in the accounting policies.
[2] Figures have been restated to be in accordance with IAS 39 Financial Instruments: Recognition and Measurement, as described in the accounting policies.