v3.26.1
Basis of Presentation and Nature of Operations (Details)
$ / shares in Units, $ in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
network
location
shares
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
network
location
shares
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
$ / shares
shares
Oct. 08, 2025
USD ($)
Jan. 19, 2024
CAD ($)
Jun. 23, 2023
USD ($)
Jun. 30, 2020
$ / shares
Basis of Presentation and Nature of Operations [Abstract]                  
Long-term debt $ 547.2   $ 547.2   $ 550.0        
Operating revenues 554.6 $ 481.7 1,082.5 $ 941.8          
Auction Fees | Revision of Prior Period, Reclassification, Adjustment [Member]                  
Basis of Presentation and Nature of Operations [Abstract]                  
Operating revenues   (134.9)   (260.1)          
Auction and Related Fees                  
Basis of Presentation and Nature of Operations [Abstract]                  
Operating revenues 259.0 213.9 500.8 412.8          
Auction and Related Fees | Revision of Prior Period, Reclassification, Adjustment [Member]                  
Basis of Presentation and Nature of Operations [Abstract]                  
Operating revenues   213.9   412.8          
Service Revenue | Revision of Prior Period, Reclassification, Adjustment [Member]                  
Basis of Presentation and Nature of Operations [Abstract]                  
Operating revenues   (142.1)   (282.4)          
SaaS and Other Revenue                  
Basis of Presentation and Nature of Operations [Abstract]                  
Operating revenues $ 73.4 63.1 $ 140.9 129.7          
SaaS and Other Revenue | Revision of Prior Period, Reclassification, Adjustment [Member]                  
Basis of Presentation and Nature of Operations [Abstract]                  
Operating revenues   $ 63.1   $ 129.7          
Marketplace                  
Basis of Presentation and Nature of Operations [Abstract]                  
Number of vehicle logistics center locations (Canada) | network 14   14            
Finance                  
Basis of Presentation and Nature of Operations [Abstract]                  
Number of floorplan financing locations | location 90   90            
Series A Preferred Stock [Member]                  
Basis of Presentation and Nature of Operations [Abstract]                  
Series A Preferred Stock par value per share | $ / shares         $ 0.01       $ 0.01
Series A Preferred Stock shares outstanding | shares 0   0   300,277        
Credit Agreement | Revolving Credit Facility                  
Basis of Presentation and Nature of Operations [Abstract]                  
Maximum borrowing capacity $ 325.0   $ 325.0         $ 325.0  
Long-term debt 0.0   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   0.0        
Credit Agreement | 2025 Incremental Term Loans                  
Basis of Presentation and Nature of Operations [Abstract]                  
Long-term debt $ 547.2   $ 547.2   $ 550.0 $ 550.0