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KAR Auction Services, Inc. Stock-Based Compensation Plans (Details) - KAR Auction Services, Inc. 2009 Omnibus Stock and Incentive Plan $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) installment $ / shares shares | Dec. 31, 2022 USD ($) employee installment $ / shares shares | Dec. 31, 2021 USD ($) installment $ / shares shares
Stock and Stock-Based Compensation Plans |  |  |
Maximum number of shares to be issued pursuant to awards | 7,300,000 |  |
Remaining shares available | 2,800,000 |  |
PRSUs |  |  |
Stock and Stock-Based Compensation Plans |  |  |
Fair value of shares vested during period | $ | $ 0.0 | $ 2.1 | $ 2.7
Unrecognized compensation expense related to nonvested PRSUs and/or RSUs (in dollars) | $ | $ 5.3 |  |
Weighted average term for recognizing unrecognized compensation expense | 1 year 7 months 6 days |  |
Number of PRSUs and/or RSUs |  |  |
PRSUs and/or RSUs outstanding at the beginning of period (in shares) | 1,456,736 |  |
PRSUs and/or RSUs grants (in shares) | 540,752 | 500,000 | 700,000
Vested (in shares) | 0 |  |
Forfeited (in shares) | (418,893) |  |
PRSUs and/or RSUs outstanding at the end of period (in shares) | 1,578,595 | 1,456,736 |
Weighted Average Grant Date Fair Value |  |  |
PRSUs and/or RSUs outstanding weighted average grant date fair value | $ / shares | $ 16.44 | $ 18.24 |
PRSUs and/or RSUs grant date fair value | $ / shares | 16.09 |  |
Forfeited (in dollars per share) | $ / shares | $ 22.25 |  |
RSUs |  |  |
Stock and Stock-Based Compensation Plans |  |  |
Fair value of shares vested during period | $ | $ 8.0 | $ 5.3 | $ 3.8
Unrecognized compensation expense related to nonvested PRSUs and/or RSUs (in dollars) | $ | $ 10.6 |  |
Weighted average term for recognizing unrecognized compensation expense | 1 year 7 months 6 days |  |
Number of equal annual installments | installment | 3 | 3 | 3
Number of PRSUs and/or RSUs |  |  |
PRSUs and/or RSUs outstanding at the beginning of period (in shares) | 1,365,882 |  |
PRSUs and/or RSUs grants (in shares) | 606,728 | 1,200,000 | 500,000
Vested (in shares) | (544,191) |  |
Forfeited (in shares) | (78,543) |  |
PRSUs and/or RSUs outstanding at the end of period (in shares) | 1,349,876 | 1,365,882 |
Weighted Average Grant Date Fair Value |  |  |
PRSUs and/or RSUs outstanding weighted average grant date fair value | $ / shares | $ 14.27 | $ 14.88 |
PRSUs and/or RSUs grant date fair value | $ / shares | 14.19 | $ 14.82 | $ 13.93
Vested (in dollars per share) | $ / shares | 15.56 |  |
Forfeited (in dollars per share) | $ / shares | $ 15.23 |  |
PRSUs - Adjusted EBITDA |  |  |
Stock and Stock-Based Compensation Plans |  |  |
PRSUs vesting period | 3 years | 3 years |
Number of PRSUs and/or RSUs |  |  |
Number of participants affected by modification | employee |  | 13 |
Incremental cost from modification | $ |  | $ 0.0 |
Weighted Average Grant Date Fair Value |  |  |
PRSUs and/or RSUs grant date fair value | $ / shares | $ 14.25 | $ 18.46 |
PRSUs - Operating Adjusted EPS |  |  |
Stock and Stock-Based Compensation Plans |  |  |
PRSUs vesting period |  |  | 3 years
Number of PRSUs and/or RSUs |  |  |
PRSUs and/or RSUs grants (in shares) |  |  | 500,000
Weighted Average Grant Date Fair Value |  |  |
PRSUs and/or RSUs grant date fair value | $ / shares |  |  | $ 15.37
PRSUs Operational Goals |  |  |
Number of PRSUs and/or RSUs |  |  |
PRSUs and/or RSUs grants (in shares) |  |  | 200,000
PRSUs - TSR PRSUs |  |  |
Stock and Stock-Based Compensation Plans |  |  |
PRSUs vesting period | 3 years |  |
Weighted Average Grant Date Fair Value |  |  |
PRSUs and/or RSUs grant date fair value | $ / shares | $ 21.62 |  |

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