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Segmental analysis - Contributions by Geographical Area (Parenthetical) (Detail) - GBP (£)
£ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Disclosure of geographical areas [line items]      
Revenue [1] £ 5,582.7 £ 6,368.2 [2] £ 13,234.1
Headline operating profit [3] 382.3 617.3 [4] 1,560.6
United States [member]      
Disclosure of geographical areas [line items]      
Revenue 2,065.2 2,203.8 4,576.5
Revenue less pass-through costs 1,757.5 1,843.0 3,806.3
Headline operating profit £ 207.1 £ 262.8 £ 620.6
[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] A reconciliation from operating (loss)/profit to headline operating profit is provided in note 23.
[4] 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.