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Employee benefit expense - Number of Directors (Details) | 12 Months Ended
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Dec. 31, 2022 Option director | Dec. 31, 2021 Option director | Dec. 31, 2020 Option director
Number of Directors accruing retirement benefits |  |  |
-defined contribution schemes |  | 2 | 3
Number of Directors exercising share options | 1 | 2 | 2
Number of Directors receiving shares as part of long-term incentive schemes | 2 | 2 | 3
Highest paid director |  |  |
Number of Directors accruing retirement benefits |  |  |
Shares options exercised | Option | 0 | 163,625 | 0

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- Definition The number of share options exercised in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 45 -Subparagraph b -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45_b_iv&doctype=Standard -URIDate 2023-03-23 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | rto_NumberOfDirectorsAccruingRetirementBenefitsAbstract
Namespace Prefix: | rto_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of Directors accruing retirement benefits under defined contribution schemes. + References No definition available. + Details
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Namespace Prefix: | rto_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of Directors exercising share options. + References No definition available. + Details
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Namespace Prefix: | rto_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of Directors receiving shares as part of long-term incentive schemes + References No definition available. + Details
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Namespace Prefix: | rto_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |