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Sale of ADESA U.S. Physical Auction Business and Discontinued Operations (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	May 09, 2022	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Discontinued Operations
Term of commercial agreement	7 years
Net cash inflow from the commercial agreement and transition services				$ 88.7	$ 74.6
Service Revenue - KAR to ADESA U.S. Physical Auctions		$ 0.3	$ 12.9	$ 0.7	55.7
Cost of Service - KAR to ADESA U.S. Physical Auctions			$ 12.9		$ 55.7

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- Definition

Cost of Service - KAR to ADESA U.S. Physical Auctions

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Service Revenue - KAR to ADESA U.S. Physical Auctions

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- Definition

Amount of cash inflow (outflow) from (to) the discontinued operation after the disposal transaction.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-4B

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Period of expected continuing involvement with a discontinued operation after the disposal date, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-4B

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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