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Basis of Presentation and Nature of Operations (Details)
$ / shares in Units, $ in Millions, $ in Millions
3 Months Ended
Mar. 31, 2025
USD ($)
network
location
$ / shares
shares
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
shares
Jan. 19, 2024
CAD ($)
Jun. 23, 2023
USD ($)
May 31, 2017
Basis of Presentation and Nature of Operations [Abstract]            
Long-term debt $ 233.4   $ 230.7      
Reclassifications            
Finance interest expense 27.6 $ 32.6        
Finance provision for credit losses $ 9.0 13.6        
Marketplace            
Basis of Presentation and Nature of Operations [Abstract]            
Number of vehicle logistics center locations (Canada) | network 15          
Marketplace | Operating Segments            
Reclassifications            
Finance interest expense $ 0.0 0.0        
AFC            
Basis of Presentation and Nature of Operations [Abstract]            
Number of floorplan financing locations | location 90          
Finance | Operating Segments            
Reclassifications            
Finance interest expense $ 27.6 32.6        
Finance provision for credit losses   $ 13.6        
Series A Preferred Stock [Member]            
Basis of Presentation and Nature of Operations [Abstract]            
Series A Preferred Stock par value per share | $ / shares $ 0.01          
Series A Preferred Stock shares outstanding | shares 634,305   634,305      
Senior Notes [Member]            
Basis of Presentation and Nature of Operations [Abstract]            
Senior notes stated interest rate 5.125%         5.125%
Long-term debt $ 210.0   $ 210.0      
Credit Agreement | Revolving Credit Facility            
Basis of Presentation and Nature of Operations [Abstract]            
Maximum borrowing capacity 325.0       $ 325.0  
Long-term debt 0.0   0.0      
Credit Agreement | Canadian Revolving Credit Facility            
Basis of Presentation and Nature of Operations [Abstract]            
Maximum borrowing capacity       $ 175    
Long-term debt $ 0.0   $ 0.0