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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended
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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.

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