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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2022-03-24
-Paragraph 128
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2022-en-r&anchor=para_128_a&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_AssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

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

- Definition

The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2022-03-24
-Paragraph 114
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2022-en-r&anchor=para_114&doctype=Standard
-URIDate 2022-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2022-03-24
-Paragraph 113
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2022-en-r&anchor=para_113_a&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_RevenueFromContractsWithCustomers
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

- 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

- 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

- Definition

Estimation uncertainty affecting revenue

+ References

No definition available.

+ Details

Name:	rto_EstimationUncertaintyAffectingRevenue
Namespace Prefix:	rto_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number of businesses

+ References

No definition available.

+ Details

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

- 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

- 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

- 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

- Details

Name:	ifrs-full_GeographicalAreasAxis=rto_UkAndIrelandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

Name:	ifrs-full_PerformanceObligationsAxis=ifrs-full_PerformanceObligationsSatisfiedAtPointInTimeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Revenue recognition and operating segments (Details) £ in Millions	12 Months Ended
	Dec. 31, 2022 GBP (£) item	Dec. 31, 2021 GBP (£) item	Dec. 31, 2020 GBP (£)
Disclosure of disaggregation of revenue from contracts with customers
Revenue	£ 3,714	£ 2,957	£ 2,803
Contract costs	182	75	68
Amortisation of contract costs	39	30	28
Impairment losses on contract costs	£ 0	£ 0	0
Number of secondary reportable business segments \| item	3	3
UK & Ireland
Disclosure of disaggregation of revenue from contracts with customers
Revenue			288
Minimum
Disclosure of disaggregation of revenue from contracts with customers
Amortization period of contract costs	3 years
Minimum \| UK & Ireland
Disclosure of disaggregation of revenue from contracts with customers
Estimation uncertainty affecting revenue			(1)
Maximum
Disclosure of disaggregation of revenue from contracts with customers
Amortization period of contract costs	7 years
Maximum \| UK & Ireland
Disclosure of disaggregation of revenue from contracts with customers
Estimation uncertainty affecting revenue			£ 5
Termite contracts
Disclosure of disaggregation of revenue from contracts with customers
Period of assurance warranties	12 months
Protect & Enhance
Disclosure of disaggregation of revenue from contracts with customers
Number of businesses \| item		5
Job work \| Maximum
Disclosure of disaggregation of revenue from contracts with customers
Period of service	1 month
Job work \| Hygiene & Wellbeing \| Performance obligations satisfied at point in time \| Maximum
Disclosure of disaggregation of revenue from contracts with customers
Period of service	7 days