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Divestitures (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) stores	Dec. 31, 2014 USD ($) stores
Import Stores Divested [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of businesses divested | stores	3	2
Gain on disposal	$ 7.4	$ 4.4
Gain on disposal, net of taxes	$ 4.6	2.7
Customer Lead Distribution Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal		8.4
Gain on disposal, net of taxes		$ 5.2

X

- Definition

The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation, net of taxes.

+ References

No definition available.

+ Details

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Namespace Prefix:	an_
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X

- Definition

The number of businesses divested during the period.

+ References

No definition available.

+ Details

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X

- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2443-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2941-110230

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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