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Inventories and Floor Plan Notes Payable - Schedule of Floor Plan Notes Payable (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Inventory Disclosure [Abstract]    
Floor plan notes payable: non-trade $ 2,848.0 $ 2,288.5
Floor plan notes payable 2,055.1 1,347.0
Total floor plan debt $ 4,903.1 $ 3,635.5