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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
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Statement [Line Items]      
Operating (loss)/profit £ (2,417.3) [1] £ 596.3 [2] £ 1,295.9 [1]
Amortisation and impairment of acquired intangible assets 53.1 [1] 52.8 [2] 121.5
Goodwill impairment 2,484.7 [1]   47.7 [3]
Gains on disposal of investments and subsidiaries (16.0) [1] (40.6) [2] (40.4)
Gains on remeasurement of equity interests arising from a change in scope of ownership   (0.4) [2] (0.4)
Investment and other write-downs [1] 220.6   7.5
Litigation settlement   (16.8) [2] (16.8)
Gain on sale of freehold property in New York [2]   (7.9) (7.9)
Restructuring and transformation costs 17.9 [1] 33.9 [2] 153.5
Restructuring costs in relation to COVID-19 [1] 39.3    
Headline operating profit [4] £ 382.3 £ 617.3 [5] £ 1,560.6
[1] Figures have been restated as described in the accounting policies.
[2] 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.
[3] Figures for the period ended 30 June 2020 have been restated, as described in the accounting policies.
[4] A reconciliation from operating (loss)/profit to headline operating profit is provided in note 23.
[5] 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. As a result, Data Investment Management is now excluded from the segment analysis.