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Dividends - Summary of Dividends Paid (Parenthetical) (Detail) - 5.5% Preference shares [member] - £ / shares | 6 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Disclosure of dividends [line items] |  |  |
Per cent dividend | 5.50% | 5.50% | 5.50%
Preference shares | 50,000 | 50,000 | 50,000
Par value | £ 1 | £ 1 | £ 1

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- Definition Disclosure of dividends. + References No definition available. + Details
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- Definition Preference shares annual dividend percentage. + References No definition available. + Details
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- Definition The number of shares issued by the entity, for which full payment has been received. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_79_a_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The nominal value per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_79_a_iii&doctype=Standard -URIDate 2018-03-16 + Details
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