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FLOORPLAN NOTES PAYABLE - Schedule of Floorplan Notes Payable (Details) - Line of credit - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Revolving Credit Facility — floorplan notes payable
Line of Credit Facility
Long-term debt, gross	$ 599.2	$ 511.7
Long-term debt, offset	(197.2)	(268.6)
Long-term debt	402.0	243.1
Other non-manufacturer facilities
Line of Credit Facility
Long-term debt	58.3	51.9
Floorplan notes payable — credit facility and other, net
Line of Credit Facility
Long-term debt	460.3	295.0
FMCC Facility
Line of Credit Facility
Long-term debt, gross	19.3	22.8
Long-term debt, offset	(2.4)	(3.3)
Long-term debt	16.9	19.5
Other manufacturer affiliate facilities
Line of Credit Facility
Long-term debt	227.5	216.5
Floorplan notes payable — manufacturer affiliates, net
Line of Credit Facility
Long-term debt	$ 244.4	$ 236.0

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