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INVENTORIES AND FLOOR PLAN NOTES PAYABLE
 6 Months Ended
Jun. 30, 2024
Inventory Disclosure [Abstract]  
INVENTORIES AND FLOOR PLAN NOTES PAYABLE INVENTORIES AND FLOOR PLAN NOTES PAYABLE
The components of inventories, net, consisted of the following:
(in millions)June 30, 2024December 31, 2023
New vehicles$3,892.0 $2,886.3 
Used vehicles2,060.0 1,637.5 
Parts and accessories290.9 230.1 
Total inventories$6,242.9 $4,753.9 

The new vehicle inventory cost is generally reduced by manufacturer holdbacks and incentives, while the related floor plan notes payable are reflective of the gross cost of the vehicle.
(in millions)June 30, 2024December 31, 2023
Floor plan notes payable$2,590.1 $1,347.0 
Floor plan notes payable: non-trade2,697.4 2,288.5 
Total floor plan debt$5,287.5 $3,635.5