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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
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Disclosure of reconciliation of profit before interest and taxation [Abstract]      
Profit before interest and taxation £ 851.3 £ 783.9 [1] £ 2,021.7 [1]
Amortisation and impairment of acquired intangible assets 84.0 97.8 195.1
Goodwill impairment     27.1
Gains on disposal of investments and subsidiaries (189.9) (5.9) (129.0)
(Gains)/losses on remeasurement of equity interests arising from a change in scope of ownership (0.1) 0.2 0.3
Investment write-downs 1.5   95.9
Restructuring costs 45.5 19.2 56.8
Share of exceptional losses/(gains) of associates 28.4 (13.2) (0.8)
Headline PBIT [2] £ 820.7 £ 882.0 [3] £ 2,267.1 [3]
[1] Prior year figures have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers and the change in income statement presentation, as described in note 2.
[2] A reconciliation from profit before interest and taxation (PBIT) to headline PBIT is provided in note 21.
[3] Prior year figures have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers, as described in note 2.