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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | $ 7,037.4 | $ 6,586.1 | $ 20,702.2 | $ 19,552.2
Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 6,054.9 | 5,661.6 | 17,796.3 | 16,830.7
Transferred over Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [1] | 982.5 | 924.5 | 2,905.9 | 2,721.5
New vehicle |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 3,415.6 | 3,171.2 | 10,060.0 | 9,273.0
Used vehicle |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 2,015.7 | 1,901.4 | 5,923.1 | 5,808.6
Parts and service |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 1,226.2 | 1,170.9 | 3,611.3 | 3,460.4
Finance and insurance, net |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 374.8 | 335.4 | 1,095.0 | 994.1
Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 5.1 | 7.2 | 12.8 | 16.1
AN Reportable Segment, Domestic |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 1,945.3 | 1,774.9 | 5,583.2 | 5,271.0
AN Reportable Segment, Domestic | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 1,714.8 | 1,557.0 | 4,918.9 | 4,625.2
AN Reportable Segment, Domestic | Transferred over Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [1] | 230.5 | 217.9 | 664.3 | 645.8
AN Reportable Segment, Domestic | New vehicle |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 1,001.4 | 872.5 | 2,846.7 | 2,528.8
AN Reportable Segment, Domestic | Used vehicle |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 531.0 | 507.2 | 1,544.3 | 1,566.4
AN Reportable Segment, Domestic | Parts and service |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 293.6 | 290.8 | 851.9 | 875.9
AN Reportable Segment, Domestic | Finance and insurance, net |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 118.4 | 101.2 | 338.7 | 295.0
AN Reportable Segment, Domestic | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 0.9 | 3.2 | 1.6 | 4.9
AN Reportable Segment, Import |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 2,173.1 | 2,046.2 | 6,368.7 | 6,044.5
AN Reportable Segment, Import | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 1,905.5 | 1,804.4 | 5,566.5 | 5,341.2
AN Reportable Segment, Import | Transferred over Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [1] | 267.6 | 241.8 | 802.2 | 703.3
AN Reportable Segment, Import | New vehicle |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 1,145.3 | 1,078.0 | 3,336.9 | 3,152.1
AN Reportable Segment, Import | Used vehicle |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 561.5 | 543.3 | 1,657.8 | 1,645.1
AN Reportable Segment, Import | Parts and service |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 337.5 | 307.1 | 999.1 | 891.2
AN Reportable Segment, Import | Finance and insurance, net |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 126.0 | 115.4 | 368.2 | 349.8
AN Reportable Segment, Import | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 2.8 | 2.4 | 6.7 | 6.3
AN Reportable Segment, Premium Luxury |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 2,559.4 | 2,426.0 | 7,691.7 | 7,239.3
AN Reportable Segment, Premium Luxury | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 2,181.8 | 2,064.0 | 6,567.4 | 6,177.1
AN Reportable Segment, Premium Luxury | Transferred over Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [1] | 377.6 | 362.0 | 1,124.3 | 1,062.2
AN Reportable Segment, Premium Luxury | New vehicle |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 1,268.9 | 1,220.7 | 3,876.4 | 3,592.1
AN Reportable Segment, Premium Luxury | Used vehicle |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 737.6 | 679.3 | 2,172.0 | 2,103.2
AN Reportable Segment, Premium Luxury | Parts and service |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 440.9 | 422.8 | 1,302.7 | 1,237.3
AN Reportable Segment, Premium Luxury | Finance and insurance, net |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 111.8 | 103.2 | 340.2 | 306.4
AN Reportable Segment, Premium Luxury | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 0.2 | 0.0 | 0.4 | 0.3
Corporate and other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [2] | 359.6 | 339.0 | 1,058.6 | 997.4
Corporate and other | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [2] | 252.8 | 236.2 | 743.5 | 687.2
Corporate and other | Transferred over Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [1],[2] | 106.8 | 102.8 | 315.1 | 310.2
Corporate and other | New vehicle |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [2] | 0.0 | 0.0 | 0.0 | 0.0
Corporate and other | Used vehicle |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [2] | 185.6 | 171.6 | 549.0 | 493.9
Corporate and other | Parts and service |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [2] | 154.2 | 150.2 | 457.6 | 456.0
Corporate and other | Finance and insurance, net |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [2] | 18.6 | 15.6 | 47.9 | 42.9
Corporate and other | Other |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [2] | $ 1.2 | $ 1.6 | $ 4.1 | $ 4.6
[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.

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