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Costs of services and general and administrative costs - Additional Information (Detail) - GBP (£) £ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2021 | Jun. 30, 2020
Disclosure Of Information About Operating Cost [line items] |  |  |
Restructuring and transformation costs | £ 34.3 | £ 17.9 | [1]
Litigation settlement | 21.7 |  | [1]
Impairment charge on intangible assets | 3.9 | 17.1 |
Restructuring costs in relation to Covid-19 | 19.7 | 39.3 | [1]
Impairment of goodwill |  | £ 2,812.9 | [1]
Covid-19 Pandemic |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |
Restructuring costs in relation to Covid-19 | 19.7 |  |
Investor day in december two thousand and eighteen restructuring and transformation plan [member] |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |
IT Transformation Costs | 8.1 |  |
Restructuring costs in relation to the continuing restructuring plan | £ 26.2 |  |
[1] | Figures have been restated as described in the accounting policies.

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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 2020-01-01 -Paragraph 98 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_98_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph B67 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B67_d_v&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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- Definition The amount of impairment loss recognised in profit or loss for intangible assets other than goodwill. [Refer: Impairment loss recognised in profit or loss; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_iv&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Disclosure of information about operating cost line items. + References No definition available. + Details
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- Definition The gains and losses on litigation settlements. + References No definition available. + Details
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- Definition IT Transformation Costs + References No definition available. + Details
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- Definition Restructuring and transformation costs. + References No definition available. + Details
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- Details
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- Details
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