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Costs of services and general and administrative costs - Additional Information (Detail) - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Disclosure Of Information About Operating Cost [line items] |  |  |
Restructuring costs | £ 45.5 | £ 19.2 | £ 56.8
Gains on disposal of investments and subsidiaries | 189.9 | 5.9 | 129.0
Investment write-downs | 1.5 |  | 95.9
comScore Inc. [member] |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |
Investment write-downs |  |  | 53.1
Globant S.A. [member] |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |
Gains on disposal of investments and subsidiaries | 185.3 |  |
Asatsu-DK Inc. [member] |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |
Gains on disposal of investments and subsidiaries |  |  | 92.3
Severance costs arising from a structural assessment of operations [member] |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |
Restructuring costs | £ 45.5 | £ 19.2 |
Severance costs [member] |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |
Restructuring costs |  |  | 33.7
IT services and infrastructure cost [member] |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |
Restructuring costs |  |  | £ 12.8

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- Definition The amount of expense relating to restructuring. Restructuring is a programme that is planned and controlled by management and materially changes either the scope of a business undertaken by an entity or the manner in which that business is conducted. Such programmes include: (a) the sale or termination of a line of business; (b) closure of business locations in a country or region or the relocation of activities from one country or region to another; (c) changes in management structure; and (d) fundamental reorganisations that have a material effect on the nature and focus of the entity's operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The gain on the disposal of investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Disclosure of information about operating cost line items. + References No definition available. + Details
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- Definition Investment write downs. + References No definition available. + Details
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