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FLOORPLAN NOTES PAYABLE - Schedule of Floorplan Notes Payable (Details) - Line of credit - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Revolving Credit Facility — floorplan notes payable
Line of Credit Facility
Long-term debt, gross	$ 1,029.7	$ 833.5
Long-term debt, offset	(250.0)	(140.2)
Long-term debt	779.7	693.3
Other non-manufacturer facilities
Line of Credit Facility
Long-term debt	63.4	68.8
Floorplan notes payable — credit facility and other, net
Line of Credit Facility
Long-term debt	843.1	762.1
FMCC Facility
Line of Credit Facility
Long-term debt, gross	85.1	55.1
Long-term debt, offset	(17.7)	(13.4)
Long-term debt	67.5	41.8
Other manufacturer affiliate facilities
Line of Credit Facility
Long-term debt	249.9	201.3
Floorplan notes payable — manufacturer affiliates, net
Line of Credit Facility
Long-term debt	$ 317.4	$ 243.1

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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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