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Debt financing - Additional Information (Detail) - GBP (£) £ in Millions | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
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Disclosure of bank overdraft bonds and bank loans [line items] |  |  |
Carrying amount of corporate bonds | £ 5,535.2 | £ 6,051.6 | £ 5,959.5
Carrying amount of bank loans | 580.1 | 186.8 | 624.6
Corporate bond [member] |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |
Fair value of corporate bonds | £ 5,783.4 | £ 5,965.7 | £ 6,035.1

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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 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Carrying amount of bank loans. + References No definition available. + Details
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- Definition Carrying amount of corporate bonds + References No definition available. + 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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