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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Revenues $ 6,690.4 $ 6,485.7
Transferred at Point in Time    
Disaggregation of Revenue [Line Items]    
Revenues 5,752.5 5,573.6
Transferred over Time    
Disaggregation of Revenue [Line Items]    
Revenues [1] 937.9 912.1
New vehicle    
Disaggregation of Revenue [Line Items]    
Revenues 3,248.1 2,979.3
Used vehicle    
Disaggregation of Revenue [Line Items]    
Revenues 1,922.4 1,996.1
Parts and service    
Disaggregation of Revenue [Line Items]    
Revenues 1,164.0 1,172.4
Finance and insurance, net    
Disaggregation of Revenue [Line Items]    
Revenues 352.5 334.7
Other    
Disaggregation of Revenue [Line Items]    
Revenues 3.4 3.2
AN Reportable Segment, Domestic    
Disaggregation of Revenue [Line Items]    
Revenues 1,717.4 1,756.7
AN Reportable Segment, Domestic | Transferred at Point in Time    
Disaggregation of Revenue [Line Items]    
Revenues 1,509.4 1,538.3
AN Reportable Segment, Domestic | Transferred over Time    
Disaggregation of Revenue [Line Items]    
Revenues [1] 208.0 218.4
AN Reportable Segment, Domestic | New vehicle    
Disaggregation of Revenue [Line Items]    
Revenues 860.2 814.4
AN Reportable Segment, Domestic | Used vehicle    
Disaggregation of Revenue [Line Items]    
Revenues 486.1 543.0
AN Reportable Segment, Domestic | Parts and service    
Disaggregation of Revenue [Line Items]    
Revenues 269.0 302.1
AN Reportable Segment, Domestic | Finance and insurance, net    
Disaggregation of Revenue [Line Items]    
Revenues 101.8 97.0
AN Reportable Segment, Domestic | Other    
Disaggregation of Revenue [Line Items]    
Revenues 0.3 0.2
AN Reportable Segment, Import    
Disaggregation of Revenue [Line Items]    
Revenues 2,047.3 1,979.5
AN Reportable Segment, Import | Transferred at Point in Time    
Disaggregation of Revenue [Line Items]    
Revenues 1,790.5 1,748.3
AN Reportable Segment, Import | Transferred over Time    
Disaggregation of Revenue [Line Items]    
Revenues [1] 256.8 231.2
AN Reportable Segment, Import | New vehicle    
Disaggregation of Revenue [Line Items]    
Revenues 1,062.0 1,006.8
AN Reportable Segment, Import | Used vehicle    
Disaggregation of Revenue [Line Items]    
Revenues 546.7 557.2
AN Reportable Segment, Import | Parts and service    
Disaggregation of Revenue [Line Items]    
Revenues 318.6 294.7
AN Reportable Segment, Import | Finance and insurance, net    
Disaggregation of Revenue [Line Items]    
Revenues 118.5 119.2
AN Reportable Segment, Import | Other    
Disaggregation of Revenue [Line Items]    
Revenues 1.5 1.6
AN Reportable Segment, Premium Luxury    
Disaggregation of Revenue [Line Items]    
Revenues 2,576.5 2,414.9
AN Reportable Segment, Premium Luxury | Transferred at Point in Time    
Disaggregation of Revenue [Line Items]    
Revenues 2,207.3 2,057.9
AN Reportable Segment, Premium Luxury | Transferred over Time    
Disaggregation of Revenue [Line Items]    
Revenues [1] 369.2 357.0
AN Reportable Segment, Premium Luxury | New vehicle    
Disaggregation of Revenue [Line Items]    
Revenues 1,325.9 1,158.1
AN Reportable Segment, Premium Luxury | Used vehicle    
Disaggregation of Revenue [Line Items]    
Revenues 712.1 736.2
AN Reportable Segment, Premium Luxury | Parts and service    
Disaggregation of Revenue [Line Items]    
Revenues 424.4 417.2
AN Reportable Segment, Premium Luxury | Finance and insurance, net    
Disaggregation of Revenue [Line Items]    
Revenues 114.1 103.3
AN Reportable Segment, Premium Luxury | Other    
Disaggregation of Revenue [Line Items]    
Revenues 0.0 0.1
Corporate and other    
Disaggregation of Revenue [Line Items]    
Revenues [2] 349.2 334.6
Corporate and other | Transferred at Point in Time    
Disaggregation of Revenue [Line Items]    
Revenues [2] 245.3 229.1
Corporate and other | Transferred over Time    
Disaggregation of Revenue [Line Items]    
Revenues [1],[2] 103.9 105.5
Corporate and other | New vehicle    
Disaggregation of Revenue [Line Items]    
Revenues [2] 0.0 0.0
Corporate and other | Used vehicle    
Disaggregation of Revenue [Line Items]    
Revenues [2] 177.5 159.7
Corporate and other | Parts and service    
Disaggregation of Revenue [Line Items]    
Revenues [2] 152.0 158.4
Corporate and other | Finance and insurance, net    
Disaggregation of Revenue [Line Items]    
Revenues [2] 18.1 15.2
Corporate and other | Other    
Disaggregation of Revenue [Line Items]    
Revenues [2] $ 1.6 $ 1.3
[1]
(2) Represents revenue recognized during the period for automotive repair and maintenance services.
[2]
(1) “Corporate and other” is comprised of our non-franchised businesses, including AutoNation USA used vehicle stores, collision centers, parts distribution centers, auction operations, and AutoNation Mobile Service.