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FLOORPLAN NOTES PAYABLE - Schedule of Floorplan Notes Payable (Details) - Line of Credit - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Revolving Credit Facility — floorplan notes payable, net
Line of Credit Facility
Long-term debt, gross	$ 1,282.1	$ 1,328.7
Long-term debt, offset	(105.1)	(286.3)
Long-term debt	1,177.0	1,042.4
Other non-manufacturer facilities
Line of Credit Facility
Long-term debt	241.2	212.9
Floorplan notes payable — credit facility and other, net
Line of Credit Facility
Long-term debt	1,418.2	1,255.3
FMCC Facility, net
Line of Credit Facility
Long-term debt, gross	169.2	202.0
Long-term debt, offset	0.0	(2.0)
Long-term debt	169.2	200.0
GM Financial Facility
Line of Credit Facility
Long-term debt	160.0	189.5
Other manufacturer affiliate facilities
Line of Credit Facility
Long-term debt	412.6	377.2
Floorplan notes payable — manufacturer affiliates, net
Line of Credit Facility
Long-term debt	$ 741.8	$ 766.7

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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