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Related party transactions - Summary of related party transaction outstanding (Detail) - GBP (£) £ in Millions | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
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Amounts owed by related parties |  |  |
Amounts receivable, related party transactions | £ 107.0 | £ 175.0 | £ 82.7
Amounts owed to related parties |  |  |
Amounts payable, related party transactions | (76.5) | (86.1) | (56.0)
Kantar [Member] |  |  |
Amounts owed by related parties |  |  |
Amounts receivable, related party transactions | 79.2 | 87.5 |
Amounts owed to related parties |  |  |
Amounts payable, related party transactions | (14.6) | (36.5) |
Other [Member] |  |  |
Amounts owed by related parties |  |  |
Amounts receivable, related party transactions | 27.8 | 87.5 | 82.7
Amounts owed to related parties |  |  |
Amounts payable, related party transactions | £ (61.9) | £ (49.6) | £ (56.0)

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- Definition The amounts receivable resulting from related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2019-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2019-en-r&anchor=para_20&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2019-01-01 -Paragraph 18 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2019-en-r&anchor=para_18_b&doctype=Standard -URIDate 2019-03-27 + Details
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