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v3.20.2

Assets held for sale and discontinued operations - Additional information (Detail) - GBP (£) £ in Millions |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 05, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Sep. 30, 2020
Disclosure of associates [line items] |  |  |  |  |
Goodwill impairment on classification as held for sale |  |  |  | £ (94.5) |
Net cash inflow from operating activities |  | £ (401.9) | £ (126.4) | 1,850.5 |
Net cash inflow/(outflow) from investing activities |  | (30.3) | 61.0 | 1,759.6 |
Net cash (outflow)/inflow from financing activities |  | 175.1 | (310.2) | (2,922.0) |
Kantar [member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Net cash inflow from operating activities |  | 26.8 | 135.2 | 322.9 |
Net cash inflow/(outflow) from investing activities |  | 1.1 | 26.5 | 53.2 |
Net cash (outflow)/inflow from financing activities |  | 0.9 | £ 18.8 | 27.2 |
Kantar Business [Member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Percentage of interest in associates | 40.00% |  |  |  |
Disposal of discontinued operations consideration | £ 2,140.2 | 200.1 |  |  |
Gain (loss) on disposal of discontinued operations Before Tax |  | (3.3) |  | 73.8 |
Attributable tax expense |  | £ 1.9 |  | 157.4 |
Goodwill impairment on classification as held for sale |  |  |  | £ (94.5) |
Kantar Business [Member] | Scenario forecast one [member] | Final stages [member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Disposal of discontinued operations consideration expected to be received for Final stages |  |  |  |  | £ 50.0

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