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Business combinations - Additional information (Details) - Individually immaterial acquisitions - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Business combinations
Deferred consideration	£ 22	£ 13
Contingent consideration	£ 23	28
Payment term for both deferred and contingent consideration	5 years
Release of contingent consideration liabilities not paid	£ 10	£ 1

X

- Definition

The amount, at acquisition date, of contingent consideration arrangements recognised as consideration transferred in a business combination. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2023-01-01
-Paragraph B64
-Subparagraph g
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2023-en-r&anchor=para_B64_g_i&doctype=Appendix&subtype=B
-URIDate 2023-03-23

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	credit
Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

The amount, at acquisition date, of deferred consideration arrangements recognised as consideration transferred in a business combination.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the payable term for both deferred and contingent consideration.

+ References

No definition available.

+ Details

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Namespace Prefix:	rto_
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X

- Definition

Represents the release of contingent consideration liabilities not paid.

+ References

No definition available.

+ Details

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Namespace Prefix:	rto_
Data Type:	xbrli:monetaryItemType
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X

- Details

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Namespace Prefix:
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