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Inventories and Floor Plan Notes Payable - Schedule of Floor Plan Notes Payable (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Inventory Disclosure [Abstract]    
Floor plan notes payable: non-trade $ 2,288.5 $ 1,489.4
Floor plan notes payable 1,347.0 627.2
Total floor plan debt $ 3,635.5 $ 2,116.6