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Financial instruments - Analysis of Financial Instruments Measured at Fair Value (Parenthitical) (Detail) £ in Millions	6 Months Ended
	Jun. 30, 2021 GBP (£)
Finsbury, The Glover Park Group and Hering Schuppener [Member]
Disclosure of detailed information about financial instruments [line items]
Business Acquisition,Additions to liabilities in respect of put options	£ 100.0

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

The increase in contingent liabilities recognised in a business combination through adjustments arising from the passage of time. [Refer: Contingent liabilities recognised in business combination; Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2020-01-01
-Paragraph B67
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B67_c&doctype=Appendix&subtype=B
-URIDate 2020-01-01

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- Details

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