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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | $ 5,392.0 | $ 5,279.3 | $ 10,651.9 | $ 10,418.7
Transferred at Point in Time [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 4,731.3 |  | 9,332.4 |
Transferred over Time [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [1] | 660.7 |  | 1,319.5 |
New Vehicle [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 2,949.6 | 2,930.9 | 5,751.9 | 5,727.1
Used Vehicle [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 1,298.7 | 1,201.1 | 2,629.2 | 2,442.0
Parts and Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 857.1 | 857.5 | 1,715.6 | 1,702.6
Finance and Insurance, Net [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 247.8 | 228.8 | 488.6 | 450.4
Other Goods and Services [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 38.8 | 61.0 | 66.6 | 96.6
AN Reportable Segment, Domestic [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 1,826.1 | 1,844.7 | 3,599.8 | 3,645.5
AN Reportable Segment, Domestic [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 1,653.7 |  | 3,256.5 |
AN Reportable Segment, Domestic [Member] | Transferred over Time [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [1] | 172.4 |  | 343.3 |
AN Reportable Segment, Domestic [Member] | New Vehicle [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 991.6 |  | 1,925.2 |
AN Reportable Segment, Domestic [Member] | Used Vehicle [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 447.2 |  | 910.0 |
AN Reportable Segment, Domestic [Member] | Parts and Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 268.7 |  | 539.2 |
AN Reportable Segment, Domestic [Member] | Finance and Insurance, Net [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 88.8 |  | 174.6 |
AN Reportable Segment, Domestic [Member] | Other Goods and Services [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 29.8 |  | 50.8 |
AN Reportable Segment, Import [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 1,717.0 | 1,702.2 | 3,369.6 | 3,333.9
AN Reportable Segment, Import [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 1,536.5 |  | 3,011.7 |
AN Reportable Segment, Import [Member] | Transferred over Time [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [1] | 180.5 |  | 357.9 |
AN Reportable Segment, Import [Member] | New Vehicle [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 1,018.9 |  | 1,974.7 |
AN Reportable Segment, Import [Member] | Used Vehicle [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 360.2 |  | 727.0 |
AN Reportable Segment, Import [Member] | Parts and Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 237.0 |  | 471.3 |
AN Reportable Segment, Import [Member] | Finance and Insurance, Net [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 92.1 |  | 181.4 |
AN Reportable Segment, Import [Member] | Other Goods and Services [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 8.8 |  | 15.2 |
AN Reportable Segment, Premium Luxury [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 1,730.2 | $ 1,644.1 | 3,448.0 | $ 3,260.7
AN Reportable Segment, Premium Luxury [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 1,506.8 |  | 2,999.0 |
AN Reportable Segment, Premium Luxury [Member] | Transferred over Time [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [1] | 223.4 |  | 449.0 |
AN Reportable Segment, Premium Luxury [Member] | New Vehicle [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 939.1 |  | 1,852.0 |
AN Reportable Segment, Premium Luxury [Member] | Used Vehicle [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 464.3 |  | 942.3 |
AN Reportable Segment, Premium Luxury [Member] | Parts and Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 266.1 |  | 534.7 |
AN Reportable Segment, Premium Luxury [Member] | Finance and Insurance, Net [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 60.6 |  | 118.6 |
AN Reportable Segment, Premium Luxury [Member] | Other Goods and Services [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues |  | 0.1 |  | 0.4 |
Corporate and Other [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [2] | 118.7 |  | 234.5 |
Corporate and Other [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [2] | 34.3 |  | 65.2 |
Corporate and Other [Member] | Transferred over Time [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [1],[2] | 84.4 |  | 169.3 |
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] | 27.0 |  | 49.9 |
Corporate and Other [Member] | Parts and Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [2] | 85.3 |  | 170.4 |
Corporate and Other [Member] | Finance and Insurance, Net [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [2] | 6.3 |  | 14.0 |
Corporate and Other [Member] | Other Goods and Services [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues | [2] | $ 0.1 |  | $ 0.2 |
[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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