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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
franchise
vehicleBrand
dealership
collisionCenter
state
shares
Jun. 30, 2023
shares
Jun. 30, 2024
USD ($)
franchise
collisionCenter
vehicleBrand
dealership
segment
state
shares
Jun. 30, 2023
USD ($)
shares
May 15, 2024
USD ($)
May 14, 2024
USD ($)
Business Organization [Line Items]            
Number of franchises (in franchises) | franchise 204   204      
Number of dealership locations (in dealership locations) | dealership 155   155      
Number of vehicle brands (in vehicle brands) | vehicleBrand 31   31      
Number of collision repair centers (in collision repair centers) | collisionCenter 37   37      
Number of states (in states) | state 15   15      
Number of reportable segments | segment     2      
Shares repurchased (in shares) | shares 192,599 959,803 432,389 1,070,126    
Treasury stock, retired (in shares) | shares 192,599 959,803 432,389 1,124,330    
Cash paid to acquire treasury stock | $     $ 93.2 $ 210.7    
Stock repurchase program, increase (decrease) in authorized amount | $           $ 256.2
Stock repurchase program, authorized amount | $         $ 400.0  
Stock repurchase program, remaining authorized repurchase amount | $ $ 365.6   $ 365.6      
Restricted Share Units            
Business Organization [Line Items]            
Antidilutive securities excluded from computation of earnings per share (in shares) | shares 145 714 2,865 3,947    
Performance share units            
Business Organization [Line Items]            
Antidilutive securities excluded from computation of earnings per share (in shares) | shares   0 23 0    
Luxury Brands            
Business Organization [Line Items]            
Weighted brand mix (percent)     29.00%      
Mid-line Import Brands            
Business Organization [Line Items]            
Weighted brand mix (percent)     41.00%      
Domestic Brands            
Business Organization [Line Items]            
Weighted brand mix (percent)     29.00%