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FLOORPLAN NOTES PAYABLE - Schedule of Floorplan Notes Payable (Details) - Line of credit - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Revolving Credit Facility — floorplan notes payable |  |
Line of Credit Facility |  |
Long-term debt, gross | $ 372.0 | $ 901.6
Long-term debt, offset | (331.2) | (160.4)
Long-term debt | 40.9 | 741.2
Other non-manufacturer facilities |  |
Line of Credit Facility |  |
Long-term debt | 42.9 | 26.4
Floorplan notes payable — credit facility and other, net |  |
Line of Credit Facility |  |
Long-term debt | 83.8 | 767.6
FMCC Facility |  |
Line of Credit Facility |  |
Long-term debt, gross | 29.6 | 111.2
Long-term debt, offset | (3.5) | (16.0)
Long-term debt | 26.1 | 95.2
Other manufacturer affiliate facilities |  |
Line of Credit Facility |  |
Long-term debt | 208.1 | 232.3
Floorplan notes payable — manufacturer affiliates, net |  |
Line of Credit Facility |  |
Long-term debt | $ 234.2 | $ 327.5

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