INVENTORY AND VEHICLE FLOOR PLAN NOTES PAYABLE - Floor Plan Notes Payable (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Inventory [Line Items]
Floor plan notes payable	$ 273.9	$ 218.4
Floor plans notes payable (trade)
Inventory [Line Items]
Floor plan notes payable	101.9	97.0
Floor plans notes payable - non-trade
Inventory [Line Items]
Floor plan notes payable	$ 172.0	$ 121.4

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.