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FLOORPLAN NOTES PAYABLE - Schedule of Floorplan Notes Payable (Details) - Line of Credit - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Revolving Credit Facility — floorplan notes payable, net    
Line of Credit Facility    
Long-term debt, gross $ 1,350.0 $ 1,328.7
Long-term debt, offset (402.9) (286.3)
Long-term debt 947.1 1,042.4
Other non-manufacturer facilities    
Line of Credit Facility    
Long-term debt 176.8 212.9
Floorplan notes payable — credit facility and other, net    
Line of Credit Facility    
Long-term debt 1,123.9 1,255.3
FMCC Facility, net    
Line of Credit Facility    
Long-term debt, gross 163.6 202.0
Long-term debt, offset 0.0 (2.0)
Long-term debt 163.6 200.0
GM Facility, net    
Line of Credit Facility    
Long-term debt, gross 211.0 189.5
Long-term debt, offset 0.0  
Other manufacturer affiliate facilities    
Line of Credit Facility    
Long-term debt 417.8 377.2
Floorplan notes payable — manufacturer affiliates, net    
Line of Credit Facility    
Long-term debt $ 792.4 $ 766.7