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Organization and Other Matters (Details) $ / shares in Units, $ in Millions	Dec. 31, 2023 USD ($) location network $ / shares shares	Jun. 23, 2023 USD ($)	Dec. 31, 2022 USD ($) shares	Jun. 30, 2020 $ / shares	Sep. 19, 2019 USD ($)	May 31, 2017
Organization and Other Matters
Long-term debt	$ 364.6		$ 498.7
Marketplace
Organization and Other Matters
Number of vehicle logistics center locations (Canada) | network	15
AFC
Organization and Other Matters
Number of floorplan financing locations | location	90
Series A Preferred Stock [Member]
Organization and Other Matters
Series A Preferred Stock par value per share | $ / shares	$ 0.01			$ 0.01
Series A Preferred Stock shares outstanding | shares	634,305		634,305
Senior Notes [Member]
Organization and Other Matters
Long-term debt	$ 210.0		$ 350.0
Senior notes stated interest rate	5.125%					5.125%
Credit Agreement | Senior secured revolving credit facility
Organization and Other Matters
Maximum borrowing capacity	$ 325.0	$ 325.0
Long-term debt	137.0		0.0
Previous Credit Agreement | Term Loan B-6
Organization and Other Matters
Long-term debt					$ 950.0
Previous Credit Agreement | Previous Revolving Credit Facility
Organization and Other Matters
Maximum borrowing capacity					$ 325.0
Long-term debt	$ 0.0		$ 145.0

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