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Going concern and risk management policies - Additional Information (Detail) - GBP (£) £ in Millions | Jul. 09, 2019 | Jun. 30, 2019
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Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Total committed facilities available |  | £ 7,838.2
Events After Reporting Period [member] | Kantar [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Proceeds from proposed sale | £ 3,100.0 |
Net proceeds to be retained from proposed sale | 60.00% |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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