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Reconciliation of operating profit to a headline operating profit - Summary of Reconciliation of Operating Profit to Headline Operating Profit (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement [Line Items]      
Operating profit [1] £ 1,295.9 £ 1,245.3 [2] £ 1,577.9 [2]
Goodwill impairment [3] 47.7 176.5 [2] 27.1 [2]
Gains on disposal of investments and subsidiaries (40.4) (237.9) (98.7)
(Gains)/losses on remeasurement of equity interests arising from a change in scope of ownership (0.4) (2.0) 0.3
Investment write-downs 7.5 2.0 91.7
Litigation settlement (16.8)    
Gain on sale of freehold property in New York [1] 7.9    
Continuing Operation [Member]      
Statement [Line Items]      
Operating profit 1,295.9 1,245.3 [1],[2] 1,577.9 [2]
Amortisation and impairment of acquired intangible assets 121.5 201.8 [1],[2] 138.0 [2]
Goodwill impairment 47.7 176.5 [1],[2] 27.1 [2]
Gains on disposal of investments and subsidiaries (40.4) (237.9) [1],[2] (98.7) [2]
(Gains)/losses on remeasurement of equity interests arising from a change in scope of ownership (0.4) (2.0) [1],[2] 0.3 [2]
Investment write-downs 7.5 2.0 [1],[2] 91.7 [2]
Litigation settlement (16.8)    
Gain on sale of freehold property in New York (7.9)    
Restructuring and transformation costs 153.5 265.5 [1],[2] 56.8 [2]
Headline operating profit £ 1,560.6 £ 1,651.2 [1],[2] £ 1,793.1 [2]
[1] Figures have been restated, as described in the accounting policies.
[2] Prior year figures have been re-presented in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations, as described in the accounting policies.
[3] Figures in 2018 have been restated, as described in the accounting policies.