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Reconciliation of profit before interest and taxation to headline PBIT - Summary of Reconciliation of Profit Before Interest and Taxation to Headline PBIT (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reconciliation of profit before interest and taxation to headline PBIT [abstract]      
Profit before interest and taxation £ 1,474.9 £ 2,021.7 [1] £ 2,112.9 [1]
Amortisation and impairment of acquired intangible assets 280.0 195.1 168.4
Goodwill impairment 183.9 27.1 27.0
Gains on disposal of investments and subsidiaries (235.5) (129.0) (44.3)
(Gains)/losses on remeasurement of equity interests arising from a change in scope of ownership (2.0) 0.3 (232.4)
Investment write-downs 2.0 95.9 86.1
Restructuring and transformation costs 302.3 56.8 27.4
Share of exceptional losses/(gains) of associates 41.7 (0.8) 15.2
Headline PBIT [2] £ 2,047.3 £ 2,267.1 £ 2,160.3
[1] Prior year figures have been restated for the impact of the adoption of IFRS 15 Revenue from Contracts with Customers, as described in the accounting policies.
[2] A reconciliation from profit before interest and taxation to headline PBIT is provided in note 29. PBIT is reconciled to reported profit before taxation in the consolidated income statement.