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Revenue Recognition Disaggregation of Revenue (Details) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2019

Jun. 30, 2018

Jun. 30, 2019

Jun. 30, 2018

Disaggregation of Revenue [Line Items]

Revenues

$ 5,343.8

$ 5,392.0

$ 10,325.6

$ 10,651.9

Transferred at Point in Time [Member]

Disaggregation of Revenue [Line Items]

Revenues

4,650.1

4,731.3

8,962.9

9,332.4

Transferred over Time [Member]

Disaggregation of Revenue [Line Items]

Revenues

^[1]

693.7

660.7

1,362.7

1,319.5

New Vehicle [Member]

Disaggregation of Revenue [Line Items]

Revenues

2,769.6

2,949.6

5,266.3

5,751.9

Used Vehicle [Member]

Disaggregation of Revenue [Line Items]

Revenues

1,379.4

1,298.7

2,719.0

2,629.2

Parts and Service [Member]

Disaggregation of Revenue [Line Items]

Revenues

901.5

857.1

1,778.2

1,715.6

Finance and Insurance, Net [Member]

Disaggregation of Revenue [Line Items]

Revenues

255.2

247.8

491.7

488.6

Product and Service, Other [Member]

Disaggregation of Revenue [Line Items]

Revenues

38.1

38.8

70.4

66.6

AN Reportable Segment, Domestic [Member]

Disaggregation of Revenue [Line Items]

Revenues

1,707.3

1,826.1

3,276.1

3,599.8

AN Reportable Segment, Domestic [Member] | Transferred at Point in Time [Member]

Disaggregation of Revenue [Line Items]

Revenues

1,528.4

1,653.7

2,926.5

3,256.5

AN Reportable Segment, Domestic [Member] | Transferred over Time [Member]

Disaggregation of Revenue [Line Items]

Revenues

^[1]

178.9

172.4

349.6

343.3

AN Reportable Segment, Domestic [Member] | New Vehicle [Member]

Disaggregation of Revenue [Line Items]

Revenues

894.5

991.6

1,675.5

1,925.2

AN Reportable Segment, Domestic [Member] | Used Vehicle [Member]

Disaggregation of Revenue [Line Items]

Revenues

447.0

447.2

890.4

910.0

AN Reportable Segment, Domestic [Member] | Parts and Service [Member]

Disaggregation of Revenue [Line Items]

Revenues

241.2

268.7

477.5

539.2

AN Reportable Segment, Domestic [Member] | Finance and Insurance, Net [Member]

Disaggregation of Revenue [Line Items]

Revenues

89.8

88.8

170.2

174.6

AN Reportable Segment, Domestic [Member] | Product and Service, Other [Member]

Disaggregation of Revenue [Line Items]

Revenues

34.8

29.8

62.5

50.8

AN Reportable Segment, Import [Member]

Disaggregation of Revenue [Line Items]

Revenues

1,627.3

1,717.0

3,123.4

3,369.6

AN Reportable Segment, Import [Member] | Transferred at Point in Time [Member]

Disaggregation of Revenue [Line Items]

Revenues

1,445.3

1,536.5

2,770.1

3,011.7

AN Reportable Segment, Import [Member] | Transferred over Time [Member]

Disaggregation of Revenue [Line Items]

Revenues

^[1]

182.0

180.5

353.3

357.9

AN Reportable Segment, Import [Member] | New Vehicle [Member]

Disaggregation of Revenue [Line Items]

Revenues

916.1

1,018.9

1,736.3

1,974.7

AN Reportable Segment, Import [Member] | Used Vehicle [Member]

Disaggregation of Revenue [Line Items]

Revenues

388.0

360.2

757.5

727.0

AN Reportable Segment, Import [Member] | Parts and Service [Member]

Disaggregation of Revenue [Line Items]

Revenues

229.2

237.0

449.4

471.3

AN Reportable Segment, Import [Member] | Finance and Insurance, Net [Member]

Disaggregation of Revenue [Line Items]

Revenues

91.4

92.1

175.9

181.4

AN Reportable Segment, Import [Member] | Product and Service, Other [Member]

Disaggregation of Revenue [Line Items]

Revenues

2.6

8.8

4.3

15.2

AN Reportable Segment, Premium Luxury [Member]

Disaggregation of Revenue [Line Items]

Revenues

1,820.9

1,730.2

3,555.0

3,448.0

AN Reportable Segment, Premium Luxury [Member] | Transferred at Point in Time [Member]

Disaggregation of Revenue [Line Items]

Revenues

1,577.7

1,506.8

3,074.9

2,999.0

AN Reportable Segment, Premium Luxury [Member] | Transferred over Time [Member]

Disaggregation of Revenue [Line Items]

Revenues

^[1]

243.2

223.4

480.1

449.0

AN Reportable Segment, Premium Luxury [Member] | New Vehicle [Member]

Disaggregation of Revenue [Line Items]

Revenues

959.0

939.1

1,854.5

1,852.0

AN Reportable Segment, Premium Luxury [Member] | Used Vehicle [Member]

Disaggregation of Revenue [Line Items]

Revenues

507.8

464.3

1,004.5

942.3

AN Reportable Segment, Premium Luxury [Member] | Parts and Service [Member]

Disaggregation of Revenue [Line Items]

Revenues

285.7

266.1

563.9

534.7

AN Reportable Segment, Premium Luxury [Member] | Finance and Insurance, Net [Member]

Disaggregation of Revenue [Line Items]

Revenues

68.4

60.6

130.0

118.6

AN Reportable Segment, Premium Luxury [Member] | Product and Service, Other [Member]

Disaggregation of Revenue [Line Items]

Revenues

0.0

0.1

2.1

0.4

Corporate and Other [Member]

Disaggregation of Revenue [Line Items]

Revenues

^[2]

188.3

118.7

371.1

234.5

Corporate and Other [Member] | Transferred at Point in Time [Member]

Disaggregation of Revenue [Line Items]

Revenues

^[2]

98.7

34.3

191.4

65.2

Corporate and Other [Member] | Transferred over Time [Member]

Disaggregation of Revenue [Line Items]

Revenues

^[1],[2]

89.6

84.4

179.7

169.3

Corporate and Other [Member] | New Vehicle [Member]

Disaggregation of Revenue [Line Items]

Revenues

^[2]

0.0

0.0

0.0

0.0

Corporate and Other [Member] | Used Vehicle [Member]

Disaggregation of Revenue [Line Items]

Revenues

^[2]

36.6

27.0

66.6

49.9

Corporate and Other [Member] | Parts and Service [Member]

Disaggregation of Revenue [Line Items]

Revenues

^[2]

145.4

85.3

287.4

170.4

Corporate and Other [Member] | Finance and Insurance, Net [Member]

Disaggregation of Revenue [Line Items]

Revenues

^[2]

5.6

6.3

15.6

14.0

Corporate and Other [Member] | Product and Service, Other [Member]

Disaggregation of Revenue [Line Items]

Revenues

^[2]

$ 0.7

$ 0.1

$ 1.5

$ 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, auction operations, AutoNation USA stand-alone used vehicle sales and service centers, and parts distribution centers.

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+ References

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
-Paragraph 22
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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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