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FLOORPLAN NOTES PAYABLE - Schedule of Floorplan Notes Payable (Details) - Line of credit - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Revolving credit facility - floorplan notes payable
Line of Credit Facility
Long-term debt, gross	$ 1,328.7	$ 1,358.2
Long-term debt, offset	(286.3)	(236.7)
Long-term debt	1,042.4	1,121.6
Other non-manufacturer facilities
Line of Credit Facility
Long-term debt	212.9	31.4
Floorplan notes payable — credit facility and other, net
Line of Credit Facility
Long-term debt	1,255.3	1,153.0
FMCC facility
Line of Credit Facility
Long-term debt, gross	202.0	156.6
Long-term debt, offset	(2.0)	(38.5)
Long-term debt	200.0	118.1
GM Financial Facility
Line of Credit Facility
Long-term debt	189.5	37.9
Other manufacturer affiliate facilities
Line of Credit Facility
Long-term debt	377.2	256.4
Floorplan notes payable — manufacturer affiliates, net
Line of Credit Facility
Long-term debt	$ 766.7	$ 412.4

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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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