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Commitments and Contingencies (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 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