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Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 segments		Mar. 31, 2014 segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Number of reportable segments	3us-gaap_NumberOfReportableSegments		3us-gaap_NumberOfReportableSegments
Total consolidated revenue	$ 4,944.2us-gaap_Revenues		$ 4,363.5us-gaap_Revenues
Total segment income	248.4an_SegmentIncomeLoss	[1]	212.5an_SegmentIncomeLoss	[1]
Corporate and other	(46.7)an_CorporateAndOtherIncomeAndAdjustments		(36.6)an_CorporateAndOtherIncomeAndAdjustments
Other interest expense	(21.4)us-gaap_InterestExpenseDebt		(21.6)us-gaap_InterestExpenseDebt
Interest income	0.1us-gaap_InvestmentIncomeInterest		0us-gaap_InvestmentIncomeInterest
Other income, net	1.1us-gaap_OtherNonoperatingIncomeExpense		1.5us-gaap_OtherNonoperatingIncomeExpense
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	181.5us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest		155.8us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
AN Reportable Segments [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total consolidated revenue	4,907.6us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = an_ANReportableSegmentsMember		4,328.8us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = an_ANReportableSegmentsMember
AN Reportable Segment, Domestic [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total consolidated revenue	1,665.7us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = an_ANReportableSegmentDomesticMember		1,473.0us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = an_ANReportableSegmentDomesticMember
Total segment income	79.3an_SegmentIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = an_ANReportableSegmentDomesticMember	[1]	63.8an_SegmentIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = an_ANReportableSegmentDomesticMember	[1]
AN Reportable Segment, Import [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total consolidated revenue	1,678.7us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = an_ANReportableSegmentImportMember		1,549.4us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = an_ANReportableSegmentImportMember
Total segment income	75.0an_SegmentIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = an_ANReportableSegmentImportMember	[1]	65.4an_SegmentIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = an_ANReportableSegmentImportMember	[1]
AN Reportable Segment, Premium Luxury [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total consolidated revenue	1,563.2us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = an_ANReportableSegmentPremiumLuxuryMember		1,306.4us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = an_ANReportableSegmentPremiumLuxuryMember
Total segment income	94.1an_SegmentIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = an_ANReportableSegmentPremiumLuxuryMember	[1]	83.3an_SegmentIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = an_ANReportableSegmentPremiumLuxuryMember	[1]
Corporate and Other [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total consolidated revenue	$ 36.6us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember		$ 34.7us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
[1] Segment income represents income for each of our reportable segments and is defined as operating income less floorplan interest expense.

X

- Definition

Operating income related to other businesses, including collision centers, customer lead distribution business, and an auction operation, each of which generates revenues. Amount also includes unallocated corporate overhead expenses, floorplan interest expense on used floorplan facilities, and retrospective commissions.

+ References

No definition available.

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- Definition

Represents operating income less floorplan interest expense for each of the reportable segments.

+ References

No definition available.

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X

- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 20

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35710027&loc=d3e41242-110953



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 5

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

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X

- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Article 5



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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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- Definition

The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 9

-Article 5



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-Publisher FASB

-Name Accounting Standards Codification

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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/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

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