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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 £ (2,453.4) £ 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.