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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Basis of Presentation and Nature of Operations (Details) $ / shares in Units, $ in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026 USD ($) location network shares	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($) location network shares	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) $ / shares shares	Oct. 08, 2025 USD ($)	Jan. 19, 2024 CAD ($)	Jun. 23, 2023 USD ($)	Jun. 30, 2020 $ / shares
Basis of Presentation and Nature of Operations [Abstract]
Long-term debt	$ 545.9		$ 545.9		$ 550.0
Operating revenues	561.2	$ 498.4	1,643.7	$ 1,440.2
Auction Fees \| Revision of Prior Period, Reclassification, Adjustment [Member]
Basis of Presentation and Nature of Operations [Abstract]
Operating revenues		(136.3)		(396.4)
Auction and Related Fees
Basis of Presentation and Nature of Operations [Abstract]
Operating revenues	253.2	215.2	754.0	628.0
Auction and Related Fees \| Revision of Prior Period, Reclassification, Adjustment [Member]
Basis of Presentation and Nature of Operations [Abstract]
Operating revenues		215.2		628.0
Service Revenue \| Revision of Prior Period, Reclassification, Adjustment [Member]
Basis of Presentation and Nature of Operations [Abstract]
Operating revenues		(144.2)		(426.6)
SaaS and Other Revenue
Basis of Presentation and Nature of Operations [Abstract]
Operating revenues	$ 73.9	65.3	$ 214.8	195.0
SaaS and Other Revenue \| Revision of Prior Period, Reclassification, Adjustment [Member]
Basis of Presentation and Nature of Operations [Abstract]
Operating revenues		$ 65.3		$ 195.0
Marketplace
Basis of Presentation and Nature of Operations [Abstract]
Number of vehicle logistics center locations (Canada) \| network	14		14
Finance
Basis of Presentation and Nature of Operations [Abstract]
Number of floorplan financing locations \| location	90		90
Series A Preferred Stock [Member]
Basis of Presentation and Nature of Operations [Abstract]
Series A Preferred Stock par value per share \| $ / shares					$ 0.01				$ 0.01
Series A Preferred Stock shares outstanding \| shares	0		0		300,277
Credit Agreement \| Revolving Credit Facility
Basis of Presentation and Nature of Operations [Abstract]
Maximum borrowing capacity	$ 325.0		$ 325.0					$ 325.0
Long-term debt	0.0		0.0		$ 0.0
Credit Agreement \| Canadian Revolving Credit Facility
Basis of Presentation and Nature of Operations [Abstract]
Maximum borrowing capacity							$ 175
Long-term debt	0.0		0.0		0.0
Credit Agreement \| 2025 Incremental Term Loans
Basis of Presentation and Nature of Operations [Abstract]
Long-term debt	$ 545.9		$ 545.9		$ 550.0	$ 550.0