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GUARANTEES - Summary (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Guarantees [Abstract] |  |
Letters of credit | $ 371,840 | $ 337,476
Surety bonds | $ 147,091 | $ 115,848

X
- Definition The total amount of surety bonds outstanding which primarily guarantee various insurance activities. + References No definition available. + Details
Name: | r_SuretyBondOutstanding
Namespace Prefix: | r_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant