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Debt financing - Additional Information (Detail) - GBP (£) £ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
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Disclosure of bank overdraft bonds and bank loans [line items] |  |  |
Carrying amount of bank loans | £ 624.6 | £ 993.4 | £ 1,343.0
Corporate bond [member] |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |
Fair value of corporate bonds | £ 6,035.1 | £ 5,816.5 | £ 5,868.2

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- Definition The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The amount of loans received. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Disclosure of bank overdraft bonds and bank loans. + References No definition available. + Details
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- Details
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