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Accounting policies - Hyperinflation in Argentina - Additional Information (Detail) - Argentina [Member] - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Hyperinflationary Reporting [line items] |  |
Increase in goodwill due to hyperinflation | £ 41.0 | £ 105.8
Increase in other intangibles due to hyperinflation | £ 7.1 | £ 19.5

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- Definition Disclosure of Hyperinflationary Reporting [line items] + References No definition available. + Details
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- Definition Hyperinflationary adjustment goodwill. + References No definition available. + Details
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- Definition Hyperinflationary adjustment other intangibles. + References No definition available. + Details
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- Details
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