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ACQUISITIONS AND DIVESTITURES - Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 21, 2025
USD ($)
dealership
franchise
collisionCenter
Jul. 30, 2025
dealership
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
business
Sep. 30, 2025
USD ($)
dealership
franchise
Sep. 30, 2024
USD ($)
business
franchise
dealership
Dec. 31, 2024
USD ($)
Business Combination [Line Items]              
Goodwill | $     $ 2,264.8   $ 2,264.8   $ 2,044.7
Number of businesses acquired | business       0   0  
Gain on divestitures, net | $     35.7 $ 5.0 45.8 $ 8.6  
Asset impairments | $     $ 11.7 $ 0.0 26.0 135.4  
Disposed of by sale | Franchises & Dealerships Sold              
Business Combination [Line Items]              
Gain on divestitures, net | $         $ 45.8 $ 8.6  
Disposed of by sale | Toyota Franchise              
Business Combination [Line Items]              
Number of franchises, sold (in franchises) | franchise         2    
Number of dealership locations, sold (in dealership locations) | dealership         2    
Disposed of by sale | Nissan Franchise              
Business Combination [Line Items]              
Number of franchises, sold (in franchises) | franchise         1    
Number of dealership locations, sold (in dealership locations) | dealership         1    
Disposed of by sale | Nissan Franchise | Colorado              
Business Combination [Line Items]              
Number of franchises, sold (in franchises) | franchise           1  
Number of dealership locations, sold (in dealership locations) | dealership           1  
Disposed of by sale | Nissan Franchise | GEORGIA              
Business Combination [Line Items]              
Number of franchises, sold (in franchises) | franchise           1  
Number of dealership locations, sold (in dealership locations) | dealership           1  
Disposed of by sale | Chrysler Jeep Dodge Ram Franchise | Colorado              
Business Combination [Line Items]              
Number of franchises, sold (in franchises) | franchise         1    
Number of dealership locations, sold (in dealership locations) | dealership         1    
Disposed of by sale | Chrysler Jeep Dodge Ram Franchise | UTAH              
Business Combination [Line Items]              
Number of franchises, sold (in franchises) | franchise         2    
Number of dealership locations, sold (in dealership locations) | dealership         2    
Disposed of by sale | Volvo Franchise              
Business Combination [Line Items]              
Number of franchises, sold (in franchises) | franchise         1    
Number of dealership locations, sold (in dealership locations) | dealership         1    
Disposed of by sale | Franchises Sold in Salt Lake City, Utah              
Business Combination [Line Items]              
Number of franchises, sold (in franchises) | franchise         6    
Disposed of by sale | Lexus Franchise              
Business Combination [Line Items]              
Number of franchises, sold (in franchises) | franchise         2 1  
Number of dealership locations, sold (in dealership locations) | dealership   2     2 1  
Disposed of by sale | Chevrolet Franchise              
Business Combination [Line Items]              
Number of franchises, sold (in franchises) | franchise         1    
Number of dealership locations, sold (in dealership locations) | dealership         1    
Disposed of by sale | Ford Franchise              
Business Combination [Line Items]              
Number of franchises, sold (in franchises) | franchise         1    
Number of dealership locations, sold (in dealership locations) | dealership         1    
Disposed of by sale | General Motors              
Business Combination [Line Items]              
Number of dealership locations, sold (in dealership locations) | dealership   2          
Herb Chambers Dealerships              
Business Combination [Line Items]              
Payments to acquire businesses, gross | $ $ 1,780.0            
Aggregate purchase price | $ 1,783.9            
Goodwill | $ $ 290.1            
Dealerships acquired | dealership 33            
Franchises acquired | franchise 52            
Collision centers acquired | collisionCenter 3            
Acquisition related costs | $ $ 14.7