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FLOORPLAN NOTES PAYABLE - Schedule of Floorplan Notes Payable (Details) - Line of Credit - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Revolving Credit Facility — floorplan notes payable |  |
Line of Credit Facility |  |
Long-term debt, gross | $ 1,303.0 | $ 1,358.2
Long-term debt, offset | (99.8) | (236.7)
Long-term debt | 1,203.2 | 1,121.6
Other non-manufacturer facilities |  |
Line of Credit Facility |  |
Long-term debt | 240.1 | 31.4
Floorplan notes payable — credit facility and other, net |  |
Line of Credit Facility |  |
Long-term debt | 1,443.4 | 1,153.0
FMCC Facility |  |
Line of Credit Facility |  |
Long-term debt, gross | 162.1 | 156.6
Long-term debt, offset | 0.0 | (38.5)
Long-term debt | 162.1 | 118.1
GM Financial Facility |  |
Line of Credit Facility |  |
Long-term debt | 239.1 | 37.9
Other manufacturer affiliate facilities |  |
Line of Credit Facility |  |
Long-term debt | 424.9 | 256.4
Floorplan notes payable — manufacturer affiliates, net |  |
Line of Credit Facility |  |
Long-term debt | $ 826.1 | $ 412.4

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