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Service and Market Options (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($) installment $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares
Number of Options |  |  |
Outstanding at the beginning of the period (in shares) | 4,800,000 | 5,800,000 |
Outstanding at the end of the period (in shares) | 4,900,000 | 4,800,000 | 5,800,000
KAR Auction Services, Inc. 2009 Omnibus Stock and Incentive Plan | Service options |  |  |
Stock and Stock-Based Compensation Plans |  |  |
Fair value assumption - expected term | 6 years 3 months |  | 6 years 3 months
Closing stock price (in dollars per share) | $ / shares | $ 14.81 |  |
Total intrinsic value of options exercised (in dollars) | $ | $ 500,000 | $ 500,000 | $ 500,000
Fair market value of vested and exercisable options (in dollars) | $ | $ 9,900,000 | $ 8,100,000 |
Weighted average grant date fair value of options granted | $ / shares | $ 7.14 |  | $ 3.98
Weighted average term for recognizing unrecognized compensation expense | 2 years |  |
Options granted | 53,222 |  | 1,100,000
Fair value assumption expected - dividend yield | 0.00% |  | 3.80%
Fair Value Assumptions, Risk Free Interest Rate | 3.38% |  | 1.06%
Fair Value Assumptions, Expected Volatility | 44.31% |  | 36.55%
Number of Options |  |  |
Outstanding at the beginning of the period (in shares) | 1,286,097 |  |
Granted (in shares) | 53,222 |  | 1,100,000
Exercised (in shares) | (156,752) |  |
Forfeited (in shares) | 0 |  |
Canceled (in shares) | (19,293) |  |
Outstanding at the end of the period (in shares) | 1,163,274 | 1,286,097 |
Exercisable at the end of the period (in shares) | 665,409 |  |
Weighted Average Exercise Price |  |  |
Outstanding at the end of the period (in dollars per share) | $ / shares | $ 15.18 | $ 14.71 |
Exercised (in dollars per share) | $ / shares | 11.31 |  |
Canceled (in dollars per share) | $ / shares | 14.05 |  |
Outstanding at the beginning of the period (in dollars per share) | $ / shares | 14.71 |  |
Exercisable at the end of the period (in dollars per share) | $ / shares | $ 14.64 |  |
Weighted Average Remaining Contractual Term |  |  |
Outstanding at the end of the period | 6 years 1 month 6 days |  |
Exercisable at the end of the period | 5 years |  |
Aggregate Intrinsic Value |  |  |
Outstanding at the end of the period (in dollars) | $ | $ 1,100,000 |  |
Exercisable at the end of the period (in dollars) | $ | $ 900,000 |  |
Term of award | 10 years |  |
Number of equal annual installments | installment | 4 |  |
Service Period For Recognition Of Compensation Expense | 4 years |  |
Granted (in dollars per share) | $ / shares | $ 14.83 |  | $ 16.15
Unrecognized compensation expense related to nonvested options | $ | $ 1,300,000 |  |
KAR Auction Services, Inc. 2009 Omnibus Stock and Incentive Plan | Market Options |  |  |
Stock and Stock-Based Compensation Plans |  |  |
Closing stock price (in dollars per share) | $ / shares | $ 14.81 |  |
Weighted average grant date fair value of options granted | $ / shares | $ 6.91 |  | $ 3.91
Weighted average term for recognizing unrecognized compensation expense | 2 years 6 months |  |
Options granted | 212,886 |  | 4,300,000
Number of Options |  |  |
Outstanding at the beginning of the period (in shares) | 3,557,134 |  |
Granted (in shares) | 212,886 |  | 4,300,000
Exercised (in shares) | 0 |  |
Forfeited (in shares) | 0 |  |
Canceled (in shares) | 0 |  |
Outstanding at the end of the period (in shares) | 3,770,020 | 3,557,134 |
Exercisable at the end of the period (in shares) | 0 |  |
Weighted Average Exercise Price |  |  |
Outstanding at the end of the period (in dollars per share) | $ / shares | $ 16.02 | $ 16.09 |
Outstanding at the beginning of the period (in dollars per share) | $ / shares | $ 16.09 |  |
Weighted Average Remaining Contractual Term |  |  |
Outstanding at the end of the period | 7 years 6 months |  |
Aggregate Intrinsic Value |  |  |
Outstanding at the end of the period (in dollars) | $ | $ 1,500,000 |  |
Term of award | 10 years |  |
Number of equal annual installments | installment | 4 |  |
Granted (in dollars per share) | $ / shares | $ 14.83 |  | $ 16.15
Percent of options outstanding eligible for exercise | 25.00% |  |
Consecutive trading day period required for entity's common stock to be at or above a certain amount as part of vesting conditions. | 20 days |  |
$5 common stock price hurdle | $ | $ 5 |  |
$10 common stock price hurdle | $ | 10 |  |
$15 common stock price hurdle | $ | 15 |  |
$20 common stock price hurdle | $ | 20 |  |
Unrecognized compensation expense related to nonvested options | $ | $ 2,700,000 |  |

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