The amount of cash balances held at banks.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2023-01-01
-Paragraph 45
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_45&doctype=Standard
-URIDate 2023-03-23

+ Details

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

- Definition

The non-current portion of non-current borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard
-URIDate 2023-03-23

+ Details

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

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_NotionalAmount
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Advance period for financing debt maturities

+ References

No definition available.

+ Details

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

- Definition

The fair market value of borrowings of the entity.

+ References

No definition available.

+ Details

Name:	rto_BorrowingsFairMarketValue
Namespace Prefix:	rto_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage of incremental interest rate payable on the borrowings, in the event that the Group is downgraded to BB+ or below (sub-investment grade).

+ References

No definition available.

+ Details

Name:	rto_BorrowingsIncrementalInterestRatePayable
Namespace Prefix:	rto_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period within which the borrowings may be called for redemption by investors, if the Group's debt is downgraded below investment grade, or if the rating is withdrawn.

+ References

No definition available.

+ Details

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

- Definition

Amount of combined headroom available with the entity as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	rto_CombinedHeadroom
Namespace Prefix:	rto_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The (decrease) increase in interest payable as a result of movement in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations.

+ References

No definition available.

+ Details

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

- Definition

The constitution of foreign currencies as a percentage of the entity's adjusted operating profit.

+ References

No definition available.

+ Details

Name:	rto_ForeignCurrenciesAsPercentageOfAdjustedOperatingProfit
Namespace Prefix:	rto_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

Name:	rto_IfrsLineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	rto_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The impact on income statement as a result of an increase in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations.

+ References

No definition available.

+ Details

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

- Definition

The increase (decrease) in adjusted operating profit as a result of movement in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations.

+ References

No definition available.

+ Details

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

- Definition

The increase (decrease) in market value of bond liabilities as a result of an increase in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations.

+ References

No definition available.

+ Details

Name:	rto_IncreaseDecreaseInMarketValueOfBondLiabilitiesDueToReasonablyPossibleIncreaseInDesignatedRiskComponent
Namespace Prefix:	rto_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Increase (decrease) in other comprehensive income due to reasonably possible movement in risk assumption

+ References

No definition available.

+ Details

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

- Definition

Increase (decrease) in other comprehensive income due to reasonably possible movement in risk assumption, offsetting impact of net investment hedging

+ References

No definition available.

+ Details

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

- Definition

Minimum period forward for which the estimated future interest rate exposures are to be fixed by the entity.

+ References

No definition available.

+ Details

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

- Definition

Minimum period from which the Treasury Committee of the entity, manages financing requirements and associated headroom.

+ References

No definition available.

+ Details

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

- Definition

Number of relationship banks with whom the company has borrowings.

+ References

No definition available.

+ Details

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

- Definition

Percentage of estimated future interest rate exposures (excluding pensions) to be fixed by the entity for a minimum period of 12 months forward.

+ References

No definition available.

+ Details

Name:	rto_PercentageOfEstimatedFutureInterestRateExposuresExcludingPensionsToBeFixed
Namespace Prefix:	rto_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The reasonably possible percentage of the movement in the designated risk component used to determine the value of the financial instrument. Excludes defined benefit plan obligations.

+ References

No definition available.

+ Details

Name:	rto_PercentageOfMovementInRiskAssumption
Namespace Prefix:	rto_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage of the entity's net debt.

+ References

No definition available.

+ Details

Name:	rto_PercentageOfNetDebt
Namespace Prefix:	rto_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of headroom of unrestricted cash and available committed facilities as required by the entity's policy.

+ References

No definition available.

+ Details

Name:	rto_RequiredHeadroomOfUnrestrictedCashAndAvailableCommittedFacilities
Namespace Prefix:	rto_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Threshold amount of foreign currencies exposure that is covered by foreign exchange derivatives by the entity.

+ References

No definition available.

+ Details

Name:	rto_ThresholdAmountOfForeignCurrenciesExposureCoveredByForeignExchangeDerivatives
Namespace Prefix:	rto_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of unrestricted cash held by the entity.

+ References

No definition available.

+ Details

Name:	rto_UnrestrictedCash
Namespace Prefix:	rto_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	ifrs-full_BorrowingsByNameAxis=rto_BondDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_LiquidityRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=rto_RevolvingCreditFacilitysMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=rto_Eur400mBondEur500mBondEur600mBondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_CreditRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ExternalCreditGradesAxis=rto_BelowaMinusMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CounterpartiesAxis=rto_SingleBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_CurrencyRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_USD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_EUR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=srt_OtherCurrencyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_InterestRateRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Financial risk management (Details) £ in Millions, $ in Billions	12 Months Ended
	Dec. 31, 2022 GBP (£) item	Dec. 31, 2021 GBP (£)	Dec. 31, 2022 USD ($)
Financial risk management
Book value	£ 3,574.0	£ 1,256.0
Bond Debt
Financial risk management
Fair market value	2,826.0	1,272.0
Book value	2,987.0	1,254.0
Liquidity Risk
Financial risk management
Required headroom of unrestricted cash and available committed facilities	£ 600.0
Minimum period for which Treasury Committee manages financing requirements and associated headroom	12 months
Unrestricted cash	£ 867.0
Combined headroom	£ 1,694.0	785.0
Advance period for financing debt maturities	12 months
Liquidity Risk \| Revolving credit facility
Financial risk management
Available commitments	£ 827.0		$ 1.0
Notional amount of debt		550.0	$ 1.0
Number of relationship banks \| item	16
Liquidity Risk \| €400m bond, €500m bond, €600m bond
Financial risk management
Increase in coupon payable percentage, in the event that the Group is downgraded to BB+ or below	1.25%
Period for redemption of bonds	120 days
Credit risk \| Below A-
Financial risk management
Balances with banks	£ 36.0	11.0
Credit risk \| Below A- \| Single bank
Financial risk management
Balances with banks	£ 14.0	£ 2.0
Foreign exchange risk
Financial risk management
Foreign currencies as a percentage of Group's adjusted operating profit	104.00%
Threshold amount of foreign currencies exposure covered by foreign exchange derivatives	£ 0.5
Percentage of movement in risk assumption	10.00%		10.00%
Foreign exchange risk \| US dollar
Financial risk management
Foreign currencies as a percentage of Group's adjusted operating profit	48.00%
Threshold amount of foreign currencies exposure covered by foreign exchange derivatives	£ 5.0
Percentage of net debt	66.00%	57.00%
Percentage of movement in risk assumption	10.00%		10.00%
Increase (decrease) in adjusted operating profit due to reasonably possible movement in risk assumption	£ 25.0	£ 19.0
Decrease (increase) in interest payable due to reasonably possible movement in risk assumption	3.0	2.0
Increase (decrease) in other comprehensive income due to reasonably possible movement in risk assumption	377.0	50.0
Increase (decrease) in other comprehensive income due to reasonably possible movement in risk assumption, offsetting impact of net investment hedging	£ 210.0	£ 54.0
Foreign exchange risk \| Euro
Financial risk management
Foreign currencies as a percentage of Group's adjusted operating profit	29.00%
Percentage of net debt	23.00%	45.00%
Percentage of movement in risk assumption	10.00%		10.00%
Increase (decrease) in adjusted operating profit due to reasonably possible movement in risk assumption	£ 15.0	£ 16.0
Decrease (increase) in interest payable due to reasonably possible movement in risk assumption	3.0	1.0
Increase (decrease) in other comprehensive income due to reasonably possible movement in risk assumption	0.0	5.0
Increase (decrease) in other comprehensive income due to reasonably possible movement in risk assumption, offsetting impact of net investment hedging	£ 46.0	42.0
Foreign exchange risk \| Other currencies
Financial risk management
Percentage of net debt	11.00%
Interest rate risk
Financial risk management
Percentage of estimated future interest rate exposures (excluding pensions) to be fixed	50.00%
Minimum period for which estimated future interest rate exposures are to be fixed	12 months
Interest rate risk \| Euro
Financial risk management
Percentage of movement in risk assumption	1.00%		1.00%
Increase (decrease) in market value of the Group's bond liabilities due to reasonably possible increase in designated risk component	£ (128.0)	(62.0)
Income statement impact due to reasonably possible increase in designated risk component	0.0
Interest rate risk \| Bond Debt
Financial risk management
Fair market value	2,826.0	1,272.0
Book value	£ 2,987.0	£ 1,254.0