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Provision for post-employment benefits - Additional Information (Detail) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of defined benefit plans [line items] |  |  |
Employer contributions (for funded plans) and benefit payments (for unfunded plans) | £ 37.1 | £ 44.9 | £ 68.2
Employer contributions (for funded plans) and benefit payments (for unfunded plans), expected in 2020. | £ 25.0 |  |
Years life expectancy after age 65 - Current pensioners (at age 65) - male [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Actuarial assumption of life expectancy | 22 years 2 months 12 days | 22 years 2 months 12 days |
Years life expectancy after age 65 - Current pensioners (at age 65) - female [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Actuarial assumption of life expectancy | 23 years 8 months 12 days | 23 years 10 months 24 days |
Years life expectancy after age 65 - Future pensioners (current age 45) - male [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Actuarial assumption of life expectancy | 23 years 9 months 18 days | 24 years |
Years life expectancy after age 65 - Future pensioners (current age 45) - female [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Actuarial assumption of life expectancy | 25 years 4 months 24 days | 25 years 8 months 12 days |

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- Definition The life expectancy after retirement used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_f&doctype=Standard -URIDate 2019-03-27 + Details
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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 estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_147_b&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_148_d_iii&doctype=Standard -URIDate 2019-03-27 + Details
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