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Commitments and Contingencies (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2024 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Significant Change In Legal And Regulatory Proceedings | $ 0.0

X
- Definition Represents the amount of significant change in legal and regulatory proceedings during the reporting period. + References No definition available. + Details
Name: | kar_SignificantChangeInLegalAndRegulatoryProceedings
Namespace Prefix: | kar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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