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Provision for post-employment benefits - Surplus/(Deficit) in Plans by Region (Detail) - GBP (£) £ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure of defined benefit plans [line items] |  |  |
Surplus/(deficit) in plans | £ (159.0) | £ (183.4) | £ (205.4)
United Kingdom [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Surplus/(deficit) in plans | 0.3 | 33.7 | 31.5
North America [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Surplus/(deficit) in plans | (45.2) | (68.7) | (89.2)
Western Continental Europe [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Surplus/(deficit) in plans | (79.4) | (104.6) | (107.7)
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Surplus/(deficit) in plans | £ (34.7) | £ (43.8) | £ (40.0)

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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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