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ACQUISITIONS - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Business Acquisition [Line Items]      
Goodwill $ 1,725.6 $ 1,460.7 $ 977.3
2023 Acquisition      
Business Acquisition [Line Items]      
Trade receivables, net 75.0    
Inventories 573.2    
Goodwill 30.5    
Property and equipment 393.0    
Operating lease right-of-use assets 89.6    
Finance receivables, net 8.0    
Other assets 725.4    
Trade payables (83.5)    
Floor plan notes payable (353.7)    
Borrowings on lines of credit (47.9)    
Finance lease obligations (45.0)    
Deferred taxes, net 9.8    
Other liabilities (162.4)    
Total net assets acquired and liabilities assumed $ 1,212.0