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Auditor's remuneration (Details) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Auditor's remuneration. |  |  |
Fees payable to the Company's auditor for the audit of the Parent Company and Group accounts | £ 3 | £ 2 | £ 1
Audit of accounts of subsidiaries of the Group | 4 | 3 | 2
Audit-related assurance services | 2 |  |
Total audit and audit-related assurance services | 9 | 5 | 3
Non-audit services | 3 |  |
Total | 12 | £ 5 | £ 3
Amount paid to the Company's auditor in respect of the 2021 PCAOB group audit | £ 2 |  |

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- Definition The amount of fees paid or payable to the entity's auditors. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_112_c&doctype=Standard -URIDate 2022-03-24 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition The amount of fees paid to the entity's auditors in respect of the 2021 PCAOB group audit. + References No definition available. + Details
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- Definition The amount of fees paid or payable to the entity's auditors for audit services in assurance services. + References No definition available. + Details
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Namespace Prefix: | rto_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The amount of fees paid or payable to the entity's auditors for audit services in subsidiaries. + References No definition available. + Details
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- Definition Fees payable to the Company's auditor for the audit of the Parent Company and Group accounts + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The amount of fees paid or payable to the non-audit services. + References No definition available. + Details
Name: | rto_NonAuditServices
Namespace Prefix: | rto_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represent to information related to Total audit and audit-related assurance services. + References No definition available. + Details
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