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FLOOR PLAN NOTES PAYABLE - Schedule of Floor Plan Notes Payable (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Payables and Accruals [Abstract]    
Floor plan notes payable—trade $ 311.7 $ 245.6
Floor plan notes payable offset account (4.5) (50.5)
Floor plan notes payable—trade, net 307.2 195.1
Floor plan notes payable—new non-trade 1,371.4 1,328.1
Floor plan notes payable—used non-trade 0.0 307.1
Floor plan notes payable offset account (192.7) (44.7)
Floor plan notes payable—non-trade, net $ 1,178.8 $ 1,590.6