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FLOORPLAN NOTES PAYABLE - Schedule of Floorplan Notes Payable (Details) - Line of credit - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Revolving credit facility — floorplan notes payable
Line of Credit Facility
Long-term debt, gross	$ 511.5	$ 901.6
Long-term debt, offset	(326.1)	(160.4)
Long-term debt	185.4	741.2
Other non-manufacturer facilities
Line of Credit Facility
Long-term debt	39.1	26.4
Floorplan notes payable — credit facility and other, net
Line of Credit Facility
Long-term debt	224.5	767.6
FMCC Facility
Line of Credit Facility
Long-term debt, gross	26.8	111.2
Long-term debt, offset	0.0	(16.0)
Long-term debt	26.8	95.2
Other manufacturer affiliate facilities
Line of Credit Facility
Long-term debt	247.2	232.3
Floorplan notes payable — manufacturer affiliates, net
Line of Credit Facility
Long-term debt	$ 274.0	$ 327.5

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