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Provision for post-employment benefits - Fair Value of Assets and Assessed Present Value of Liabilities in Pension Plans (Detail) - GBP (£) £ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of defined benefit plans [abstract] |  |  |
Fair value of assets allocation, Equities | 9.10% | 9.10% | 13.40%
Fair value of assets allocation, Bonds | 44.80% | 64.80% | 55.90%
Fair value of assets allocation, Insured annuities | 39.30% | 10.80% | 19.20%
Fair value of assets allocation, Property | 0.10% | 0.10% | 0.10%
Fair value of assets allocation, Cash | 2.90% | 3.70% | 1.10%
Fair value of assets allocation, Other | 3.80% | 11.50% | 10.30%
Total fair value of assets allocation | 100.00% | 100.00% | 100.00%
Fair value of assets, Equities | £ 55.5 | £ 76.5 | £ 124.6
Fair value of assets, Bonds | 272.5 | 544.9 | 520.0
Fair value of assets, Insured annuities | 239.1 | 90.9 | 178.5
Fair value of assets, Property | 0.7 | 0.9 | 1.3
Fair value of assets, Cash | 17.7 | 31.1 | 9.9
Fair value of assets, Other | 23.0 | 96.3 | 95.7
Total fair value of assets | 608.5 | 840.6 | 930.0
Present value of liabilities | (767.5) | (1,024.0) | (1,135.4)
Deficit in the plans | (159.0) | (183.4) | (205.4)
Irrecoverable surplus | 0.0 | (0.9) | (0.9)
Net liability | (159.0) | (184.3) | (206.3)
Plans in surplus | 20.6 | 42.8 | 43.9
Plans in deficit | £ (179.6) | £ (227.1) | £ (250.2)

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- Definition The amount cash and cash equivalents contribute to the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 142 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_142_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 142 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_142_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount instruments representing equity (rather than debt) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 142 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_142_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_140_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount other types of assets not separately disclosed contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 142 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_142&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount real estate contributes to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 142 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_142_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_57_a&doctype=Standard -URIDate 2019-03-27 + Details
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