v3.26.1
ACQUISITIONS AND DIVESTITURES - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 21, 2025
USD ($)
franchise
collisionCenter
dealership
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
business
Jun. 30, 2025
USD ($)
business
Dec. 31, 2025
USD ($)
Business Combination [Line Items]            
Goodwill   $ 2,269.7   $ 2,269.7   $ 2,281.3
Number of businesses acquired | business       0 0  
Gain on divestitures, net   0.0 $ 5.9 $ 125.8 $ 10.1  
Asset impairments   $ 4.2 $ 0.0 4.2 14.3  
Disposed of by sale | Franchises & Dealerships Sold            
Business Combination [Line Items]            
Gain on divestitures, net       (125.8) $ (10.1)  
Herb Chambers Dealerships            
Business Combination [Line Items]            
Payments to acquire businesses, gross $ 1,760.0          
Aggregate purchase price 1,761.8          
Goodwill $ 343.0          
Dealerships acquired | dealership 33          
Franchises acquired | franchise 52          
Collision centers acquired | collisionCenter 3          
Intangible franchise rights $ 428.5          
Business Combination, Acquiree's Revenue since Acquisition Date, Actual       1,190.0    
Business Combination, Acquiree's Earnings (Loss) since Acquisition Date, Actual       $ 34.2    
Herb Chambers Dealerships | New vehicle floor plan facility | Line of Credit            
Business Combination [Line Items]            
Aggregate purchase price 292.0          
Herb Chambers Dealerships | Used vehicle floor plan facility | Line of Credit            
Business Combination [Line Items]            
Aggregate purchase price 300.0          
Herb Chambers Dealerships | Revolving credit facility | Line of Credit            
Business Combination [Line Items]            
Aggregate purchase price 623.3          
Herb Chambers Dealerships | Real estate facility | Line of Credit            
Business Combination [Line Items]            
Aggregate purchase price $ 546.5