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FLOOR PLAN NOTES PAYABLE - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Apr. 09, 2025 | Apr. 08, 2025 | Dec. 31, 2024
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Floor Plan Notes Payable [Line Items] |  |  |  |
Debt instrument, conversion, maximum convertible amount, amount subtracted from contractual total | $ 50.0 |  |  |
Loaner Vehicle Notes Payable - Bank of America |  |  |  |
Floor Plan Notes Payable [Line Items] |  |  |  |
Notes payable | 69.6 |  |  | $ 56.7
Loaner Vehicle Floorplan Facility |  |  |  |
Floor Plan Notes Payable [Line Items] |  |  |  |
Notes payable | $ 202.9 |  |  | $ 161.5
2023 Senior Credit Facility | Line of Credit | Revolving credit facility |  |  |  |
Floor Plan Notes Payable [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 925.0 | $ 500.0 |
2023 Senior Credit Facility | Line of Credit | New vehicle floor plan facility |  |  |  |
Floor Plan Notes Payable [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 2,250.0 | $ 1,930.0 |

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