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Assets held for sale and discontinued operations - Additional information (Detail) - GBP (£) £ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 27, 2020 | Dec. 05, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement [LineItems] |  |  |  |  |  |
Goodwill impairment on classification as held for sale | [1] |  |  | £ (94.5) |  |
Disposal of discontinued operations consideration expected to be received for remaining stages |  |  | £ 200.0 |  |  |
Net cash inflow from operating activities |  |  |  | 1,850.5 | £ 1,693.8 | £ 1,408.1
Net cash inflow/(outflow) from investing activities |  |  |  | 1,759.6 | 184.5 | (499.7)
Net cash (outflow)/inflow from financing activities |  |  |  | (2,922.0) | (1,613.8) | (785.6)
Kantar [member] |  |  |  |  |  |
Statement [LineItems] |  |  |  |  |  |
Net cash inflow from operating activities |  |  |  | 322.9 | 292.5 | 378.4
Net cash inflow/(outflow) from investing activities |  |  |  | (53.2) | (59.5) | (67.8)
Net cash (outflow)/inflow from financing activities |  |  |  | (27.2) | £ (7.9) | £ (9.1)
Kantar second stage [member] |  |  |  |  |  |
Statement [LineItems] |  |  |  |  |  |
Proportion of the Kantar group included in the second stage of the transaction completed |  | 4.00% |  |  |  |
Disposal of major subsidiary [member] | Kantar second stage [member] |  |  |  |  |  |
Statement [LineItems] |  |  |  |  |  |
Disposal group discontinued operation cash consideration received |  | £ 136.7 |  |  |  |
Kantar Business [Member] |  |  |  |  |  |
Statement [LineItems] |  |  |  |  |  |
Percentage of interest in associates |  |  | 40.00% |  |  |
Proportion of the Kantar group included in the first stage of the transaction completed |  |  | 90.00% |  |  |
Goodwill impairment on classification as held for sale |  |  |  | (94.5) |  |
Attributable tax expense |  |  |  | 157.4 |  |
Gain on disposal of discontinued operations Before Tax |  |  |  | £ 73.8 |  |
Disposal of discontinued operations consideration |  |  | £ 2,140.2 |  |  |
[1] | Goodwill impairment of £94.5 million arose from the assessment of fair value less costs to sell under IFRS 5.

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