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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | $ 21,335.7 |  | $ 21,412.8 |  | $ 21,534.6
Transferred at Point in Time [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 18,604.7 |  | 18,759.5 |  |
Transferred over Time [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | [1] | 2,731.0 |  | 2,653.3 |  |
New Vehicle [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 11,166.5 |  | 11,751.6 |  | 12,180.8
Used Vehicle [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 5,466.5 |  | 5,123.3 |  | 4,878.4
Parts and Service [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 3,572.1 |  | 3,447.6 |  | 3,398.3
Finance and Insurance, Net [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 1,023.3 |  | 981.4 |  | 939.2
Product and Service, Other [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 107.3 |  | 108.9 |  | 137.9
AN Reportable Segment, Domestic [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 6,671.4 |  | 7,134.5 |  | 7,452.8
AN Reportable Segment, Domestic [Member] | Transferred at Point in Time [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 5,969.6 |  | 6,441.2 |  |
AN Reportable Segment, Domestic [Member] | Transferred over Time [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | [1] | 701.8 |  | 693.3 |  |
AN Reportable Segment, Domestic [Member] | New Vehicle [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 3,502.5 |  | 3,900.8 |  |
AN Reportable Segment, Domestic [Member] | Used Vehicle [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 1,769.5 |  | 1,725.2 |  |
AN Reportable Segment, Domestic [Member] | Parts and Service [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 959.0 |  | 1,082.8 |  |
AN Reportable Segment, Domestic [Member] | Finance and Insurance, Net [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 354.6 |  | 344.4 |  |
AN Reportable Segment, Domestic [Member] | Product and Service, Other [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 85.8 |  | 81.3 |  |
AN Reportable Segment, Import [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 6,468.7 |  | 6,786.4 |  | 6,873.4
AN Reportable Segment, Import [Member] | Transferred at Point in Time [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 5,768.3 |  | 6,079.1 |  |
AN Reportable Segment, Import [Member] | Transferred over Time [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | [1] | 700.4 |  | 707.3 |  |
AN Reportable Segment, Import [Member] | New Vehicle [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 3,695.6 |  | 4,046.4 |  |
AN Reportable Segment, Import [Member] | Used Vehicle [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 1,501.9 |  | 1,418.7 |  |
AN Reportable Segment, Import [Member] | Parts and Service [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 889.7 |  | 934.8 |  |
AN Reportable Segment, Import [Member] | Finance and Insurance, Net [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 368.3 |  | 362.6 |  |
AN Reportable Segment, Import [Member] | Product and Service, Other [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 13.2 |  | 23.9 |  |
AN Reportable Segment, Premium Luxury [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 7,434.8 |  | 7,010.9 |  | 6,832.7
AN Reportable Segment, Premium Luxury [Member] | Transferred at Point in Time [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 6,467.5 |  | 6,098.3 |  |
AN Reportable Segment, Premium Luxury [Member] | Transferred over Time [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | [1] | 967.3 |  | 912.6 |  |
AN Reportable Segment, Premium Luxury [Member] | New Vehicle [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 3,968.4 |  | 3,804.4 |  |
AN Reportable Segment, Premium Luxury [Member] | Used Vehicle [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 2,045.6 |  | 1,875.1 |  |
AN Reportable Segment, Premium Luxury [Member] | Parts and Service [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 1,136.0 |  | 1,082.2 |  |
AN Reportable Segment, Premium Luxury [Member] | Finance and Insurance, Net [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 279.2 |  | 246.0 |  |
AN Reportable Segment, Premium Luxury [Member] | Product and Service, Other [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 5.6 |  | 3.2 |  |
Corporate and Other [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues |  | 760.8 | [2] | 481.0 | [2] | $ 375.7
Corporate and Other [Member] | Transferred at Point in Time [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | [2] | 399.3 |  | 140.9 |  |
Corporate and Other [Member] | Transferred over Time [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | [1],[2] | 361.5 |  | 340.1 |  |
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] | 149.5 |  | 104.3 |  |
Corporate and Other [Member] | Parts and Service [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | [2] | 587.4 |  | 347.8 |  |
Corporate and Other [Member] | Finance and Insurance, Net [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | [2] | 21.2 |  | 28.4 |  |
Corporate and Other [Member] | Product and Service, Other [Member] |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Revenues | [2] | $ 2.7 |  | $ 0.5 |  |
[1] | Represents revenue recognized during the period for automotive repair and maintenance services.
[2] | “Corporate and other” is comprised of our other businesses, including collision centers, auction operations, AutoNation USA stand-alone used vehicle sales and service centers, and aftermarket collision parts businesses.

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