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Reconciliation of operating (loss)/profit to headline operating profit - Summary of Reconciliation of Operating Profit to Headline Operating Profit (Detail) - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Statement [Line Items] |  |  |  |  |
Operating (loss)/profit |  | £ (2,453.4) | £ 596.3 |  | £ 1,295.9
Amortisation and impairment of acquired intangible assets |  | 53.1 | 52.8 |  | 121.5
Goodwill impairment |  | 2,520.8 |  |  | 47.7
Gains on disposal of investments and subsidiaries |  | (16.0) | (40.6) | [1] | (40.4)
Gains on remeasurement of equity interests arising from a change in scope of ownership |  |  | (0.4) | [1] | (0.4)
Investment and other write-downs |  | 220.6 |  |  | 7.5
Litigation settlement |  |  | (16.8) | [1] | (16.8)
Gain on sale of freehold property in New York |  |  | (7.9) | [1] | (7.9)
Restructuring and transformation costs |  | 17.9 | 33.9 |  | 153.5
Restructuring costs in relation to COVID-19 |  | 39.3 |  |  |
Headline operating profit | [2] | £ 382.3 | £ 617.3 | [1] | £ 1,560.6
[1] | Figures for the period ended 30 June 2019 have been re-presented in accordance with IFRS 5: Non-current Assets Held for Sale and Discontinued Operations, as described in note 13.
[2] | A reconciliation from operating (loss)/profit to headline operating profit is provided in note 23.

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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 2019-01-01 -Paragraph 98 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_98_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The gain on settlements of litigation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 98 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_98_f&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph B67 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B67_d_v&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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- Definition The profit (loss) from operating activities of the entity. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 32 -IssueDate 2019-01-01 -Paragraph IE33 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=32&code=ifrs-tx-2019-en-r&anchor=para_IE33&doctype=Illustrative%20Examples -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_85&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Gain on sale of freehold property. + References No definition available. + Details
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- Definition Gains on disposals of investments and subsidiaries. + References No definition available. + Details
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