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Reconciliation of Operating Profit to Headline Operating Profit - Summary of Reconciliation of Operating Profit to Headline Operating Profit (Detail) - GBP (£) £ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2018
Disclosure of Reconciliation of Operating Profit to Headline Operating Profit [abstract] |  |  |  |  |  |
Operating profit |  |  | £ 673.0 | £ 841.9 |  | £ 1,431.4
Amortisation and impairment of acquired intangible assets |  |  | 66.9 | 84.0 |  | 280.0
Goodwill impairment |  |  |  |  |  | 183.9
Gains on disposal of investments and subsidiaries |  |  | (40.6) | (189.9) |  | (235.5)
Gains on remeasurement of equity interests arising from a change in scope of ownership |  |  | (0.4) | (0.1) |  | (2.0)
Investment write-downs |  |  |  | 1.5 |  | 2.0
Litigation Settlement |  |  | (16.8) |  |  |
Gain on sale of freehold property in New York |  |  | (7.9) |  |  |
Restructuring and transformation costs |  | £ 234.0 | 55.4 | 45.5 | £ 68.3 | 302.3
Headline operating profit | [1] |  | £ 729.6 | £ 782.9 |  | £ 1,962.1
[1] | A reconciliation from operating profit to headline operating profit is provided in note 22.

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