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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | $ 6,752.8 | $ 5,903.8
Transferred at Point in Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 6,007.4 | 5,256.6
Transferred over Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1] | 745.4 | 647.2
New Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 2,807.2 | 2,982.3
Used Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 2,572.4 | 1,749.1
Parts and Service [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,003.9 | 851.0
Finance and Insurance, Net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 363.9 | 313.0
Product and Service, Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 5.4 | 8.4
AN Reportable Segment, Domestic [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 2,034.4 | 1,846.7
AN Reportable Segment, Domestic [Member] | Transferred at Point in Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,850.7 | 1,681.6
AN Reportable Segment, Domestic [Member] | Transferred over Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1] | 183.7 | 165.1
AN Reportable Segment, Domestic [Member] | New Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 822.5 | 935.4
AN Reportable Segment, Domestic [Member] | Used Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 823.1 | 563.7
AN Reportable Segment, Domestic [Member] | Parts and Service [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 268.7 | 234.1
AN Reportable Segment, Domestic [Member] | Finance and Insurance, Net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 119.2 | 109.3
AN Reportable Segment, Domestic [Member] | Product and Service, Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 0.9 | 4.2
AN Reportable Segment, Import [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,974.1 | 1,769.6
AN Reportable Segment, Import [Member] | Transferred at Point in Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,783.8 | 1,604.1
AN Reportable Segment, Import [Member] | Transferred over Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1] | 190.3 | 165.5
AN Reportable Segment, Import [Member] | New Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 881.6 | 958.0
AN Reportable Segment, Import [Member] | Used Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 707.6 | 484.7
AN Reportable Segment, Import [Member] | Parts and Service [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 255.5 | 214.1
AN Reportable Segment, Import [Member] | Finance and Insurance, Net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 126.4 | 109.1
AN Reportable Segment, Import [Member] | Product and Service, Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 3.0 | 3.7
AN Reportable Segment, Premium Luxury [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 2,478.7 | 2,103.5
AN Reportable Segment, Premium Luxury [Member] | Transferred at Point in Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 2,186.4 | 1,863.6
AN Reportable Segment, Premium Luxury [Member] | Transferred over Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1] | 292.3 | 239.9
AN Reportable Segment, Premium Luxury [Member] | New Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,103.1 | 1,088.9
AN Reportable Segment, Premium Luxury [Member] | Used Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 916.1 | 642.3
AN Reportable Segment, Premium Luxury [Member] | Parts and Service [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 351.9 | 285.2
AN Reportable Segment, Premium Luxury [Member] | Finance and Insurance, Net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 107.2 | 86.8
AN Reportable Segment, Premium Luxury [Member] | Product and Service, Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 0.4 | 0.3
Corporate and Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 265.6 | 184.0
Corporate and Other [Member] | Transferred at Point in Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 186.5 | 107.3
Corporate and Other [Member] | Transferred over Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1],[2] | 79.1 | 76.7
Corporate and Other [Member] | New Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 0.0 | 0.0
Corporate and Other [Member] | Used Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 125.6 | 58.4
Corporate and Other [Member] | Parts and Service [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 127.8 | 117.6
Corporate and Other [Member] | Finance and Insurance, Net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 11.1 | 7.8
Corporate and Other [Member] | Product and Service, Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | $ 1.1 | $ 0.2
[1] | (2) Represents revenue recognized during the period for automotive repair and maintenance services.
[2] | (1) “Corporate and other” is comprised of our other businesses, including collision centers, AutoNation USA used vehicle stores, auction operations, and parts distribution centers.

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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