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ACQUISITIONS AND DIVESTITURES - Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Dec. 11, 2023
USD ($)
collisionCenter
newVehicleDealership
Dec. 31, 2023
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Jun. 30, 2024
USD ($)
acquisition
franchise
dealership
Jun. 30, 2023
USD ($)
dealership
acquisition
franchise
Business Acquisition [Line Items]                
Goodwill   $ 2,009.0 $ 2,010.4       $ 2,010.4  
Revenue     4,246.2   $ 3,742.5   8,447.4 $ 7,324.8
Net income     28.1 $ 147.1 196.4 $ 181.4 $ 175.2 $ 377.7
Number of businesses acquired | acquisition             0 0
Gain on divestitures     $ 3.6   $ 13.5   $ 3.6 $ 13.5
Disposed of by sale | Delaware                
Business Acquisition [Line Items]                
Number of franchises, sold (in franchises) | franchise             1  
Number of dealership locations, sold (in dealership locations) | dealership             1  
Disposed of by sale | Colorado                
Business Acquisition [Line Items]                
Number of franchises, sold (in franchises) | franchise             1  
Number of dealership locations, sold (in dealership locations) | dealership             1  
Disposed of by sale | Georgia                
Business Acquisition [Line Items]                
Number of franchises, sold (in franchises) | franchise             1  
Number of dealership locations, sold (in dealership locations) | dealership             1  
Disposed of by sale | Texas                
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 | newVehicleDealership 20              
Number of collision centers acquired (in collision repair centers) | collisionCenter 6              
Aggregate purchase price $ 1,504.5              
Intangible franchise rights 430.3              
Goodwill 238.9              
Revenue   1,406.7            
Net income   $ 49.2            
Jim Koons Dealerships | Disposed of by sale                
Business Acquisition [Line Items]                
Aggregate purchase price $ 100.9