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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | $ 5,259.9 | $ 5,139.4
Transferred at Point in Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 4,601.1 |
Transferred over Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1] | 658.8 |
New Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 2,802.3 | 2,796.2
Used Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,330.5 | 1,240.9
Parts and Service [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 858.5 | 845.1
Finance and Insurance, Net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 240.8 | 221.6
Other Goods and Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 27.8 | 35.6
AN Reportable Segment, Domestic [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,773.7 | 1,800.8
AN Reportable Segment, Domestic [Member] | Transferred at Point in Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,602.8 |
AN Reportable Segment, Domestic [Member] | Transferred over Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1] | 170.9 |
AN Reportable Segment, Domestic [Member] | New Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 933.6 |
AN Reportable Segment, Domestic [Member] | Used Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 462.8 |
AN Reportable Segment, Domestic [Member] | Parts and Service [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 270.5 |
AN Reportable Segment, Domestic [Member] | Finance and Insurance, Net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 85.8 |
AN Reportable Segment, Domestic [Member] | Other Goods and Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 21.0 |
AN Reportable Segment, Import [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,652.6 | 1,631.7
AN Reportable Segment, Import [Member] | Transferred at Point in Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,475.2 |
AN Reportable Segment, Import [Member] | Transferred over Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1] | 177.4 |
AN Reportable Segment, Import [Member] | New Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 955.8 |
AN Reportable Segment, Import [Member] | Used Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 366.8 |
AN Reportable Segment, Import [Member] | Parts and Service [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 234.3 |
AN Reportable Segment, Import [Member] | Finance and Insurance, Net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 89.3 |
AN Reportable Segment, Import [Member] | Other Goods and Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 6.4 |
AN Reportable Segment, Premium Luxury [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,717.8 | $ 1,616.6
AN Reportable Segment, Premium Luxury [Member] | Transferred at Point in Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 1,492.2 |
AN Reportable Segment, Premium Luxury [Member] | Transferred over Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1] | 225.6 |
AN Reportable Segment, Premium Luxury [Member] | New Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 912.9 |
AN Reportable Segment, Premium Luxury [Member] | Used Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 478.0 |
AN Reportable Segment, Premium Luxury [Member] | Parts and Service [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 268.6 |
AN Reportable Segment, Premium Luxury [Member] | Finance and Insurance, Net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 58.0 |
AN Reportable Segment, Premium Luxury [Member] | Other Goods and Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | 0.3 |
Corporate and Other [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 115.8 |
Corporate and Other [Member] | Transferred at Point in Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 30.9 |
Corporate and Other [Member] | Transferred over Time [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [1],[2] | 84.9 |
Corporate and Other [Member] | New Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 0.0 |
Corporate and Other [Member] | Used Vehicle [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 22.9 |
Corporate and Other [Member] | Parts and Service [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 85.1 |
Corporate and Other [Member] | Finance and Insurance, Net [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | 7.7 |
Corporate and Other [Member] | Other Goods and Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | [2] | $ 0.1 |
[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, automotive auctions, and AutoNation USA stand-alone used vehicle sales and service centers.

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