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Provision for post-employment benefits - Movement in Pension Plan Assets (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

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