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Divestitures (Details) (Corporate and Other [Member], Customer Lead Distribution Business [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Corporate and Other [Member] | Customer Lead Distribution Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and other consideration received on disposal	$ 11
Gain on disposal	8.3
Gain on disposal, net of taxes	$ 5.1

X

- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

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Namespace Prefix:	an_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

Name:	an_DisposalGroupNotDiscontinuedOperationGainLossonDisposalNetofTaxes
Namespace Prefix:	an_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760



Reference 2: 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=8077374&loc=d3e2443-110228

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- Details

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