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Stock and Stock-Based Compensation Plan Summary (Details)
$ / shares in Units, shares in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
installment
$ / shares
shares
Sep. 30, 2022
USD ($)
Stock and Stock-Based Compensation Plans        
Stock-based compensation expense (in dollars) $ 4,200,000 $ 3,300,000 $ 13,100,000 $ 22,600,000
PRSUs        
Stock and Stock-Based Compensation Plans        
Stock-based compensation expense (in dollars) 1,500,000 1,300,000 3,400,000 15,100,000
RSUs        
Stock and Stock-Based Compensation Plans        
Stock-based compensation expense (in dollars) 1,900,000 900,000 7,100,000 3,400,000
Service options        
Stock and Stock-Based Compensation Plans        
Stock-based compensation expense (in dollars) 200,000 200,000 500,000 600,000
Market Options        
Stock and Stock-Based Compensation Plans        
Stock-based compensation expense (in dollars) $ 600,000 $ 900,000 $ 2,100,000 $ 3,500,000
KAR Auction Services, Inc. 2009 Omnibus Stock and Incentive Plan | PRSUs        
Stock and Stock-Based Compensation Plans        
PRSUs and/or RSUs grants | shares     0.5  
KAR Auction Services, Inc. 2009 Omnibus Stock and Incentive Plan | RSUs        
Stock and Stock-Based Compensation Plans        
PRSUs and/or RSUs grants | shares     0.6  
Number of equal annual installments | installment     3  
PRSUs and/or RSUs grant date fair value | $ / shares     $ 14.18  
KAR Auction Services, Inc. 2009 Omnibus Stock and Incentive Plan | Service options        
Stock and Stock-Based Compensation Plans        
Number of equal annual installments | installment     4  
Options granted | shares     0.1  
Weighted average exercise price of options granted | $ / shares     $ 14.83  
Term of award     10 years  
Weighted average grant date fair value of options granted | $ / shares     $ 7.14  
Fair value assumption - expected term     6 years 3 months  
Fair Value Assumptions - Expected Volatility     44.31%  
Fair value assumption expected - dividend yield     0.00%  
Fair Value Assumptions - Risk Free Interest Rate     3.38%  
KAR Auction Services, Inc. 2009 Omnibus Stock and Incentive Plan | Market Options        
Stock and Stock-Based Compensation Plans        
Number of equal annual installments | installment     4  
Options granted | shares     0.2  
Weighted average exercise price of options granted | $ / shares     $ 14.83  
Term of award     10 years  
Weighted average grant date fair value of options granted | $ / shares     $ 6.91  
Percent of options outstanding eligible for exercise 25.00%   25.00%  
$5 common stock price hurdle $ 5   $ 5  
$10 common stock price hurdle 10   10  
$15 common stock price hurdle 15   15  
$20 common stock price hurdle $ 20   $ 20  
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  
KAR Auction Services, Inc. 2009 Omnibus Stock and Incentive Plan | PRSUs - Adjusted EBITDA        
Stock and Stock-Based Compensation Plans        
PRSUs and/or RSUs grant date fair value | $ / shares     $ 14.25  
Award vesting period     3 years  
KAR Auction Services, Inc. 2009 Omnibus Stock and Incentive Plan | PRSUs - TSR PRSUs        
Stock and Stock-Based Compensation Plans        
PRSUs and/or RSUs grant date fair value | $ / shares     $ 21.62  
Award vesting period     3 years