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ACQUISITIONS AND DIVESTITURES - Narrative (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 11, 2023
USD ($)
collisionCenter
Dec. 31, 2023
USD ($)
Dec. 31, 2024
USD ($)
franchise
dealership
Dec. 31, 2023
USD ($)
dealership
franchise
Dec. 31, 2022
USD ($)
franchise
dealership
center
Business Acquisition [Line Items]          
Goodwill   $ 2,009.0 $ 2,044.7 $ 2,009.0 $ 1,783.4
Acquisition related costs     4.1    
Revenues     17,188.6 14,802.7 15,433.8
Net income     $ 430.3 $ 602.5 997.3
Number of dealership locations, sold (in dealership locations) | dealership     5 1  
Gain on dealership divestitures, net     $ 8.6 $ 13.5 $ 207.1
Colorado | Disposed of by Sale          
Business Acquisition [Line Items]          
Number of franchises, sold (in franchises) | franchise     1   3
Number of dealership locations, sold (in dealership locations) | dealership     1   3
Number of collision centers, sold (in collision centers) | center         1
MISSOURI | Disposed of by Sale          
Business Acquisition [Line Items]          
Number of franchises, sold (in franchises) | franchise         1
Number of dealership locations, sold (in dealership locations) | dealership         1
WASHINGTON | Disposed of by Sale          
Business Acquisition [Line Items]          
Number of franchises, sold (in franchises) | franchise     1   2
Number of dealership locations, sold (in dealership locations) | dealership     1   2
NEW MEXICO | Disposed of by Sale          
Business Acquisition [Line Items]          
Number of franchises, sold (in franchises) | franchise         1
Number of dealership locations, sold (in dealership locations) | dealership         1
NORTH CAROLINA | Disposed of by Sale          
Business Acquisition [Line Items]          
Number of franchises, sold (in franchises) | franchise         11
Number of dealership locations, sold (in dealership locations) | dealership         9
Number of collision centers, sold (in collision centers) | center         2
Texas | Disposed of by Sale          
Business Acquisition [Line Items]          
Number of franchises, sold (in franchises) | franchise       1  
Number of dealership locations, sold (in dealership locations) | dealership       1  
DELAWARE | Disposed of by Sale          
Business Acquisition [Line Items]          
Number of franchises, sold (in franchises) | franchise     1    
Number of dealership locations, sold (in dealership locations) | dealership     1    
GEORGIA | Disposed of by Sale | Nissan          
Business Acquisition [Line Items]          
Number of franchises, sold (in franchises) | franchise     1    
Number of dealership locations, sold (in dealership locations) | dealership     1    
GEORGIA | Disposed of by Sale | Chevrolet          
Business Acquisition [Line Items]          
Number of franchises, sold (in franchises) | franchise     1    
Number of dealership locations, sold (in dealership locations) | dealership     1    
Jim Koons Dealerships          
Business Acquisition [Line Items]          
Number of new vehicle dealerships acquired (in new vehicle dealerships) | collisionCenter 20        
Number of collision centers acquired (in collision centers) | collisionCenter 6        
Aggregate purchase price $ 1,504.5        
Assets held for sale 100.9        
Intangible franchise rights 401.0        
Goodwill 272.4        
Revenues   2,805.5      
Net income   $ 86.9      
Payments to acquire businesses, gross 941.3        
Goodwill, measurement period adjustment     $ 26.7    
Jim Koons Dealerships | New Floor Plan Facility          
Business Acquisition [Line Items]          
Aggregate purchase price $ 256.1        
Series of Individually Immaterial Business Acquisitions | Colorado          
Business Acquisition [Line Items]          
Goodwill and manufacturer franchise rights, period for federal and state tax deductions       15 years