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ACQUISITIONS - Other Acquisitions (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
dealership
Dec. 31, 2021
USD ($)
dealership
Dec. 31, 2020
USD ($)
Business Acquisition      
Cash paid to acquire business $ 528.7 $ 1,099.6 $ 1.3
Additions through acquisitions 246.3 453.5  
Goodwill 1,661.8 1,420.2 997.1
Other Acquisitions      
Business Acquisition      
Cash paid to acquire business 32.9 166.8  
Accounts payable 1.2    
Additions through acquisitions   70.1  
Intangible franchise rights   27.2  
U.S.      
Business Acquisition      
Additions through acquisitions 236.1 434.6  
Goodwill $ 1,549.9 $ 1,307.3 901.7
U.S. | Collision Center      
Business Acquisition      
Aggregate consideration paid for dealerships     1.3
U.S. | Other Acquisitions      
Business Acquisition      
Number of dealerships acquired | dealership 6 5  
Aggregate consideration paid for dealerships $ 507.5    
Additions through acquisitions 236.1    
Intangible franchise rights 127.4    
U.K.      
Business Acquisition      
Additions through acquisitions 10.2 $ 18.9  
Goodwill 111.9 $ 112.9 $ 95.4
U.K. | Other Acquisitions      
Business Acquisition      
Number of dealerships acquired | dealership   7  
Aggregate consideration paid for dealerships 34.1    
Goodwill $ 10.2