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FLOORPLAN NOTES PAYABLE - Schedule of Floorplan Notes Payable (Details) - Line of credit - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Revolving Credit Facility — floorplan notes payable
Line of Credit Facility
Long-term debt, gross	$ 879.1	$ 833.5
Long-term debt, offset	(106.7)	(140.2)
Long-term debt	772.4	693.3
Other non-manufacturer facilities
Line of Credit Facility
Long-term debt	76.3	68.8
Floorplan notes payable — credit facility and other, net
Line of Credit Facility
Long-term debt	848.7	762.1
FMCC Facility
Line of Credit Facility
Long-term debt, gross	81.6	55.1
Long-term debt, offset	(16.1)	(13.4)
Long-term debt	65.6	41.8
Other manufacturer affiliate facilities
Line of Credit Facility
Long-term debt	231.8	201.3
Floorplan notes payable — manufacturer affiliates, net
Line of Credit Facility
Long-term debt	$ 297.4	$ 243.1

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