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Income tax expense - Additional Information (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income tax expense
Effective tax rate	21.60%	19.00%
Blended tax rate	24.00%	24.00%
Net prior year tax credit	£ 9	£ 16	£ 9
Credited to other comprehensive income	£ 11	£ 2

X

- Definition

The tax expense (income) divided by the accounting profit. [Refer: Accounting profit]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2023-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_c_ii&doctype=Standard
-URIDate 2023-03-23

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Adjustment in respect of previous periods

+ References

No definition available.

+ Details

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

X

- Definition

Blended tax rate.

+ References

No definition available.

+ Details

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

X

- Definition

Current income tax relating to components of other comprehensive income

+ References

No definition available.

+ Details

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

X

- Definition

No definition available

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration