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FLOOR PLAN NOTES PAYABLE - Schedule of Floor Plan Notes Payable (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Payables and Accruals [Abstract]    
Floor plan notes payable—trade $ 304.8 $ 350.9
Floor plan notes payable offset account (43.0) (1.0)
Floor plan notes payable—trade, net 261.8 349.9
Floor plan notes payable—new non-trade 1,275.3 1,359.8
Floor plan notes payable—used non-trade 0.0 100.7
Floor plan notes payable offset account (73.7) (115.7)
Floor plan notes payable—non-trade, net $ 1,201.6 $ 1,344.8