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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | $ 6,485.7 | $ 6,398.7
Transferred at Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 5,573.6 | 5,570.3
Transferred over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1] | 912.1 | 828.4
New vehicle |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 2,979.3 | 2,931.9
Used vehicle |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,996.1 | 2,032.6
Parts and service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,172.4 | 1,089.8
Finance and insurance, net |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 334.7 | 332.4
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 3.2 | 12.0
Domestic |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,756.7 | 1,831.1
Domestic | Transferred at Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,538.3 | 1,629.3
Domestic | Transferred over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1] | 218.4 | 201.8
Domestic | New vehicle |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 814.4 | 828.0
Domestic | Used vehicle |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 543.0 | 612.3
Domestic | Parts and service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 302.1 | 287.6
Domestic | Finance and insurance, net |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 97.0 | 102.3
Domestic | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 0.2 | 0.9
Import |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,979.5 | 1,789.3
Import | Transferred at Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,748.3 | 1,586.9
Import | Transferred over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1] | 231.2 | 202.4
Import | New vehicle |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,006.8 | 856.4
Import | Used vehicle |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 557.2 | 542.1
Import | Parts and service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 294.7 | 268.4
Import | Finance and insurance, net |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 119.2 | 112.4
Import | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1.6 | 10.0
Premium Luxury |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 2,414.9 | 2,484.9
Premium Luxury | Transferred at Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 2,057.9 | 2,159.3
Premium Luxury | Transferred over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1] | 357.0 | 325.6
Premium Luxury | New vehicle |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,158.1 | 1,247.5
Premium Luxury | Used vehicle |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 736.2 | 745.8
Premium Luxury | Parts and service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 417.2 | 386.2
Premium Luxury | Finance and insurance, net |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 103.3 | 105.0
Premium Luxury | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 0.1 | 0.4
Corporate and other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 334.6 | 293.4
Corporate and other | Transferred at Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 229.1 | 194.8
Corporate and other | Transferred over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1],[2] | 105.5 | 98.6
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] | 159.7 | 132.4
Corporate and other | Parts and service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 158.4 | 147.6
Corporate and other | Finance and insurance, net |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 15.2 | 12.7
Corporate and other | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | $ 1.3 | $ 0.7
[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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