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Self Insurance and Retained Loss Reserves (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Changes in the reserves for self-insurance and the retained losses |  |  |
Balance at beginning of period | $ 12.5 | $ 10.4 | $ 10.0
Net payments | (33.7) | (27.8) | (33.5)
Expense | 28.4 | 29.9 | 33.9
Balance at end of period | 7.2 | 12.5 | 10.4
Individual stop-loss coverage for medical benefits | 0.5 | 0.5 | 0.5
Retention for automobile and general liability claims | 1.0 | 1.0 | 1.0
Retention for workers compensation claims | 0.5 | 0.5 | 0.5
Corridor deductible for workers compensation claims | 1.0 | 1.0 | 1.0
Deductible amount per occurrence after corridor deductible is met | 0.5 | 0.5 | 0.5
Aggregate retention for workers compensation, automobile and garage liability |  | 28.5 | 28.5
Insurance payments after aggregate retention is met up to specified amount |  | $ 7.5 | $ 7.5
Aggregate limit for general liability primary policy | $ 3.0 |  |

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- Definition Aggregate limit for general liability primary policy + References No definition available. + Details
Name: | kar_AggregateLimitForGeneralLiabilityPrimaryPolicy
Namespace Prefix: | kar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Aggregate Retention For Workers Compensation, Automobile And Garage Liability + References No definition available. + Details
Name: | kar_AggregateRetentionForWorkersCompensationAutomobileAndGarageLiability
Namespace Prefix: | kar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Corridor Deductible for Workers Compensation Claims + References No definition available. + Details
Name: | kar_CorridorDeductibleforWorkersCompensationClaims
Namespace Prefix: | kar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the deductible amount per occurrence after corridor deductible is met for workers compensation claims. + References No definition available. + Details
Name: | kar_DeductibleAmountPerOccurrenceAfterCorridorDeductibleIsMet
Namespace Prefix: | kar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the amount of individual stop-loss coverage for medical benefits. + References No definition available. + Details
Name: | kar_IndividualStopLossCoverageForMedicalBenefits
Namespace Prefix: | kar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Insurance payments after aggregate retention is met up to specified amount + References No definition available. + Details
Name: | kar_InsurancePaymentsAfterAggregateRetentionIsMetUpToSpecifiedAmount
Namespace Prefix: | kar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Retention for Automobile and General Liability Claims + References No definition available. + Details
Name: | kar_RetentionforAutomobileandGeneralLiabilityClaims
Namespace Prefix: | kar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Retention for Workers Compensation Claims + References No definition available. + Details
Name: | kar_RetentionforWorkersCompensationClaims
Namespace Prefix: | kar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the amount charged in the period against reserve for self insurance and retained losses. + References No definition available. + Details
Name: | kar_SelfInsuranceAndRetainedLossExpense
Namespace Prefix: | kar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the amount of net payments made in the period towards self insurance and retained losses. + References No definition available. + Details
Name: | kar_SelfInsuranceAndRetainedLossReservesNetPayments
Namespace Prefix: | kar_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | kar_SelfInsuranceAndRetainedLossReservesRollForward
Namespace Prefix: | kar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_SelfInsuranceReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant