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Revenue recognition and operating segments (Details) £ in Millions	12 Months Ended
	Dec. 31, 2024 GBP (£) item	Dec. 31, 2023 GBP (£)	Dec. 31, 2022 GBP (£)
Disclosure of disaggregation of revenue from contracts with customers
Contract costs	£ 238	£ 224	£ 215
Amortisation of contract costs	92	121	39
Impairment losses on contract costs	£ 0	£ 0	£ 0
Number of secondary reportable business segments | item	3
Minimum
Disclosure of disaggregation of revenue from contracts with customers
Amortization period of contract costs	3 years
Maximum
Disclosure of disaggregation of revenue from contracts with customers
Amortization period of contract costs	7 years
Termite contracts
Disclosure of disaggregation of revenue from contracts with customers
Period of assurance warranties	12 months
Job work | Maximum
Disclosure of disaggregation of revenue from contracts with customers
Period of service	1 month
Job work | Hygiene & Wellbeing | Maximum
Disclosure of disaggregation of revenue from contracts with customers
Period of service	7 days

X

- Definition

The amount of assets recognised from the costs to obtain or fulfil contracts with customers. The costs to obtain a contract with a customer are the incremental costs of obtaining the contract that the entity would not have incurred if the contract had not been obtained. The costs to fulfil a contract with a customer are the costs that relate directly to a contract or to an anticipated contract that the entity can specifically identify.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 128
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_128_a&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amortisation period of contract costs recognised by the company.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of contract costs related amortization amount.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of Contract costs related to impairment loss.

+ References

No definition available.

+ Details

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

X

- Definition

Number of secondary reportable business segments

+ References

No definition available.

+ Details

Name:	rto_NumberOfSecondaryReportableBusinessSegments
Namespace Prefix:	rto_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period of assurance warranties

+ References

No definition available.

+ Details

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

X

- Definition

Represents information pertaining to period of service.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=rto_TermiteContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfContractsAxis=rto_JobWorkMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=rto_HygieneAndWellbeingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: