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Business combinations - Additional information (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Business combinations
Deferred consideration	£ 35	£ 15
Contingent consideration	£ 32	43
Payment term for both deferred and contingent consideration	5 years
Release of contingent consideration liabilities not paid	£ 7	£ 0

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2024-01-01
-Paragraph B64
-Subparagraph g
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2024-en-r&anchor=para_B64_g_i&doctype=Appendix&subtype=B
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfBusinessCombinationsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

Name:	rto_DeferredConsiderationRecognisedAsOfAcquisitionDate
Namespace Prefix:	rto_
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

Name:	rto_PayableTermForBothDeferredAndContingentConsideration
Namespace Prefix:	rto_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the release of contingent consideration liabilities not paid.

+ References

No definition available.

+ Details

Name:	rto_ReleaseOfContingentConsiderationLiabilitiesNotPaid
Namespace Prefix:	rto_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration