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Assets held for sale and discontinued operations - Detailed Information About Amounts Of Discontinued Operations Included In Profit (Parenthetical) (Detail) - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Statement [LineItems] |  |  |  |
Impairment on Classification As Held for Sale for Kantar Group |  |  |  | £ (94.5)
Gain (loss) on disposal of business |  | £ 31.0 | £ 37.0 | 93.8
Discontinued operations [member] |  |  |  |
Statement [LineItems] |  |  |  |
Impairment on Classification As Held for Sale for Kantar Group | [1] |  |  | (94.5)
Gain (loss) on disposal of business | [2] | 9.9 | £ 6.5 | £ 14.6
Discontinued operations [member] | Kantar [member] | WPP Scan Group [member] |  |  |  |
Statement [LineItems] |  |  |  |
Gain (loss) on disposal of business |  | £ 9.3 |  |
Percentage of ownership interest in subsidiaries |  | 56.25% |  |
[1] | Goodwill impairment of £94.5 million arose from the assessment of fair value less costs to sell under IFRS 5 in the year ended 31 December 2019.
[2] | In 2020, non-controlling interests includes £9.3 million recognised on the disposal of Kantar within WPP Scangroup, a 56.25% owned subsidiary of the Group.

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