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Employee Stock Purchase Plan (Details) - KAR Auction Services, Inc. Employee Stock Purchase Plan	12 Months Ended
	Dec. 31, 2023 USD ($) shares
Stock and Stock-Based Compensation Plans
Maximum number of shares to be issued pursuant to awards	2,500,000
Remaining shares available	933,673
ESPP offering periods	1 month
Discount from fair market value of share (as a percent)	15.00%
Maximum
Stock and Stock-Based Compensation Plans
Participant's combined payroll deductions and cash payments (in dollars) | $	$ 25,000

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