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Deferred tax - Additional Information (Detail) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Gross tax losses and other temporary differences available for offset against future profits | £ 6,475.6 | £ 6,638.6
Gross tax losses and other temporary differences, deferred tax assets that have been recognised | 1,856.6 | 1,763.4
Gross tax losses and other temporary differences, deferred tax assets that have not been recognised | 4,619.0 | 4,875.2
Unrecognised temporary differences | 60.7 | 46.4
Losses carried forward | 4,437.6 | 4,572.6
Temporary differences, deferred tax liabilities that have not been recognised | £ 2,165.3 | £ 1,768.5
Bottom of range [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognised temporary differences, period | 1 year |
Top of range [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognised temporary differences, period | 10 years |

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- Definition The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of benefit arising from a previously unrecognised tax loss, tax credit or temporary difference of a prior period that is used to reduce deferred tax expense. [Refer: Deferred tax expense (income); Temporary differences [member]; Unused tax losses [member]; Unused tax credits [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 80 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_80_f&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Deductible Temporary Differences For Which No Deferred Tax Liability Is Recognised + References No definition available. + Details
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- Definition Gross Tax Losses And Other Temporary Differences Available For Offset Against Future Profits + References No definition available. + Details
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- Definition Gross Tax Losses And Other Temporary Differences Deferred Tax Assets That Have Not Been Recognised + References No definition available. + Details
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