FLOOR PLAN NOTES PAYABLE - Schedule of Floor Plan Notes Payable (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Payables and Accruals [Abstract] | ||
| Floor plan notes payable—trade | $ 303.3 | $ 344.0 |
| Floor plan notes payable offset account | (2.6) | (1.0) |
| Floor plan notes payable—trade, net | 300.7 | 343.1 |
| Floor plan notes payable—new non-trade | 1,360.4 | 1,509.6 |
| Floor plan notes payable—used non-trade | 320.0 | 325.0 |
| Floor plan notes payable offset account | (141.7) | (150.7) |
| Floor plan notes payable—non-trade, net | $ 1,538.8 | $ 1,683.9 |