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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
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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.

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