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Related party transactions - Additional Information (Detail) - GBP (£) £ in Millions |  | 6 Months Ended
--- | --- | ---
Jun. 29, 2021 | Jun. 30, 2021 | Jun. 30, 2020
Disclosure of transactions between related parties [line items] |  |  |  |
Revenue |  | £ 6,132.5 | £ 5,582.7 | [1],[2]
Kantar [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Payments for further investment | £ 92.9 |  |  |
Numerator [Member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Percentage of voting equity interests acquired | 40.00% |  |  |
USA [Member] | Compas [Member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Revenue |  | £ 93.5 | £ 49.7 |
[1] | During 2020, the Group announced the intention to combine Grey and AKQA into AKQA Group, and to bring Geometry and GTB into VMLY&R, and International Healthcare into VMLY&R and Ogilvy. As a result AKQA, Geometry, GTB and International Healthcare are now reported within Global Integrated Agencies, having previously been reported within Specialist Agencies. Prior year figure have been re-presented to reflect these changes.
[2] | Figures have been restated as described in the accounting policies.

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