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AutoNation Finance Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
AutoNation Finance Income [Line Items]    
AutoNation Finance income (loss) $ 0.1 $ (5.0)
AN Reportable Segment, AN Finance    
AutoNation Finance Income [Line Items]    
Interest and fee income 41.9 21.8
Interest expense (13.9) (7.0)
Total interest margin 28.0 14.8
Provision for credit losses (18.9) (10.2)
Total interest margin after provision for loan losses 9.1 4.6
Direct expenses [1] (9.0) (9.6)
AutoNation Finance income (loss) $ 0.1 $ (5.0)
[1]
(1) Direct expenses are comprised primarily of compensation expenses and loan administration costs incurred by our auto finance company.