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Stock and Stock-Based Compensation Plan Summary (Details) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) installment $ / shares shares	Mar. 31, 2023 USD ($)
Stock and Stock-Based Compensation Plans
Stock-based compensation expense (in dollars)	$ 6.6	$ 3.6
PRSUs
Stock and Stock-Based Compensation Plans
Stock-based compensation expense (in dollars)	3.8	(0.1)
RSUs
Stock and Stock-Based Compensation Plans
Stock-based compensation expense (in dollars)	2.9	2.8
Service options
Stock and Stock-Based Compensation Plans
Stock-based compensation expense (in dollars)	0.1	0.2
Market Options
Stock and Stock-Based Compensation Plans
Stock-based compensation expense (in dollars)	$ (0.2)	$ 0.7
KAR Auction Services, Inc. 2009 Omnibus Stock and Incentive Plan | PRSUs
Stock and Stock-Based Compensation Plans
PRSUs and/or RSUs grants | shares	0.6
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	$ 14.66
KAR Auction Services, Inc. 2009 Omnibus Stock and Incentive Plan | PRSUs - Adjusted EBITDA
Stock and Stock-Based Compensation Plans
PRSUs vesting period	3 years
PRSUs and/or RSUs grant date fair value | $ / shares	$ 14.66
KAR Auction Services, Inc. 2009 Omnibus Stock and Incentive Plan | PRSUs - TSR PRSUs
Stock and Stock-Based Compensation Plans
PRSUs vesting period	3 years
PRSUs and/or RSUs grant date fair value | $ / shares	$ 21.12

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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