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

3 Months Ended

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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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).

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