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ACQUISITIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]      
Goodwill $ 1,463.1 $ 977.3 $ 593.0
2022 Acquisitions      
Business Acquisition [Line Items]      
Accounts receivable 0.1    
Inventories 166.1    
Franchise value 63.7    
Property and equipment 325.2    
Other non-current assets 459.5    
Floor plan notes payable (0.7)    
Debt and finance lease obligations (78.2)    
Other long-term liabilities (7.3)    
Assets acquired and liabilities assumed, excluding goodwill 928.4    
Goodwill 30.1    
Total net assets acquired and liabilities assumed $ 958.5