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Costs of services and general and administrative costs - Additional Information (Detail) - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Disclosure Of Information About Operating Cost [line items] |  |  |  |
Goodwill impairment | £ 2,520.8 |  |  | £ 47.7
Gains on disposal of investments and subsidiaries | 16.0 | £ 40.6 | [1] | 40.4
Litigation settlement |  | 16.8 | [1] | £ 16.8
Lease Term |  |  |  | 15 years
Gain on sale of freehold property in New York |  | 7.9 | [1] | £ 7.9
Proceeds from sale of freehold property |  |  |  | 159.0
Impairment charge on intangible assets | 17.1 | 4.7 |  | 26.5
Investment write-downs | 220.6 |  |  | 7.5
Restructuring costs due to pandemic | 39.3 |  |  |
Covid-19 pandemic [member] |  |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |  |
Proceeds from government grants | 28.6 |  |  |
Imagina [member] |  |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |  |
Investment write-downs | 209.8 |  |  |
Investor day in december two thousand and eighteen restructuring and transformation plan [member] |  |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |  |
Restructuring and transformation costs in relation to the continuing restructuring plan | 17.9 | 23.6 |  | 121.1
Transformation costs |  | £ 10.3 |  | 32.4
Comscore Inc. [member] |  |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |  |
Litigation settlement |  |  |  | 16.8
Two Circles [member] |  |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |  |
Gains on disposal of investments and subsidiaries | £ 14.7 |  |  |
Chime [Member] |  |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |  |
Gains on disposal of investments and subsidiaries |  |  |  | 28.6
Other business [member] |  |  |  |
Disclosure Of Information About Operating Cost [line items] |  |  |  |
Goodwill impairment |  |  |  | £ 47.7
[1] | 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.

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