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Provision for post-employment benefits - Movement in Pension Plan Liabilities (Parenthetical) (Detail) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Plan assets [member] |  |  |  |
Disclosure of net defined benefit (liability) asset |  |  |  |
Settlement payments | [1] | £ (47.4) | £ (70.4) | £ (1.2)
United Kingdom [member] |  |  |  |
Disclosure of net defined benefit (liability) asset |  |  |  |
Settlement payments |  | 47.1 | £ 70.4 |
United States [member] | Plan assets [member] |  |  |  |
Disclosure of net defined benefit (liability) asset |  |  |  |
Defined Benefit Plan, Lump Sum Payouts |  | £ 69.7 |  |
[1] | In 2019 and 2018, the Group completed the transfer of the defined benefit obligations for certain UK plans to an insurer resulting in £47.1 million and £70.4 million, respectively, in settlement payments.

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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan in respect of settlements. [Refer: Gains (losses) arising from settlements, net defined benefit liability (asset); 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 g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_g&doctype=Standard -URIDate 2019-03-27 + Details
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