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Inventories and Floor Plan Notes Payable
 12 Months Ended
Dec. 31, 2024
Inventory Disclosure [Abstract]  
Inventories and Floor Plan Notes Payable Disclosure INVENTORIES AND FLOOR PLAN NOTES PAYABLE
Inventories
The components of inventories consisted of the following:
December 31,
($ in millions)20242023
New vehicles$3,555.3 $2,886.3 
Used vehicles2,085.6 1,637.5 
Parts and accessories270.8 230.1 
Total inventories$5,911.7 $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.
December 31,
($ in millions)20242023
Floor plan notes payable: non-trade$2,848.0 $2,288.5 
Floor plan notes payable2,055.1 1,347.0 
Total floor plan debt$4,903.1 $3,635.5 

See credit facilities discussion in Note 10 – Credit Facilities and Long-Term Debt for more information on our floor plan commitments.