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FLOORPLAN NOTES PAYABLE - Schedule of Floorplan Notes Payable (Details) - Line of Credit - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Revolving Credit Facility — floorplan notes payable
Line of Credit Facility
Long-term debt, gross	$ 1,229.8	$ 1,358.2
Long-term debt, offset	(210.2)	(236.7)
Long-term debt	1,019.6	1,121.6
Other non-manufacturer facilities
Line of Credit Facility
Long-term debt	24.5	31.4
Floorplan notes payable — credit facility and other, net
Line of Credit Facility
Long-term debt	1,044.1	1,153.0
FMCC Facility
Line of Credit Facility
Long-term debt, gross	106.8	156.6
Long-term debt, offset	0.0	(38.5)
Long-term debt	106.8	118.1
GM Financial Facility
Line of Credit Facility
Long-term debt	168.4	37.9
Other manufacturer affiliate facilities
Line of Credit Facility
Long-term debt	310.3	256.4
Floorplan notes payable — manufacturer affiliates, net
Line of Credit Facility
Long-term debt	$ 585.4	$ 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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