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Related party transactions - Summary of related party transaction outstanding (Detail) - GBP (£) £ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Amounts owed by related parties |  |
Amounts receivable, related party transactions | £ 181.8 | £ 66.9
Amounts owed to related parties |  |
Amounts payable, related party transactions | (68.6) | (41.6)
Kantar [Member] |  |
Amounts owed by related parties |  |
Amounts receivable, related party transactions | 135.5 | 39.0
Amounts owed to related parties |  |
Amounts payable, related party transactions | (6.3) | (5.6)
Other [Member] |  |
Amounts owed by related parties |  |
Amounts receivable, related party transactions | 46.3 | 27.9
Amounts owed to related parties |  |
Amounts payable, related party transactions | £ (62.3) | £ (36.0)

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