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Receivables, Net (Components Of Receivables, Net Of Allowance For Doubtful Accounts) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Trade receivables	$ 125.1an_TradeReceivables	$ 125.0an_TradeReceivables
Manufacturer receivables	180.4an_ManufacturerReceivables	198.3an_ManufacturerReceivables
Other	35.1us-gaap_OtherReceivablesGrossCurrent	37.9us-gaap_OtherReceivablesGrossCurrent
Trade, manufacturer and other receivables, gross	340.6an_TradeManufacturerAndOtherReceivablesGross	361.2an_TradeManufacturerAndOtherReceivablesGross
Less: Allowances	(4.0)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	(3.7)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Trade, manufacturer and other receivables, net	336.6an_TradeManufacturerAndOtherReceivablesNet	357.5an_TradeManufacturerAndOtherReceivablesNet
Contracts-in-transit and vehicle receivables	441.4an_ContractsInTransitAndVehicleReceivables	460.3an_ContractsInTransitAndVehicleReceivables
Receivables, net	$ 778.0us-gaap_ReceivablesNetCurrent	$ 817.8us-gaap_ReceivablesNetCurrent

X

- Definition

The amount due to the company from outside sources, within one year of the balance sheet date, for retail new and used vehicle sales including amounts due from customers and amounts due from financing companies for the financed portion of the vehicle sales price.

+ References

No definition available.

+ Details

Name:	an_ContractsInTransitAndVehicleReceivables
Namespace Prefix:	an_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount due to the company from manufacturers or distributors, within one year of the balance sheet date, including (1) rebates and assistance for holdbacks, floorplan interest and advertising expenses; (2) incentives based on achieving certain objectives; and (3) amounts due for warranty and service work performed for customers.

+ References

No definition available.

+ Details

Name:	an_ManufacturerReceivables
Namespace Prefix:	an_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The aggregate amount of trade receivables, manufacturer receivables and other receivables.

+ References

No definition available.

+ Details

Name:	an_TradeManufacturerAndOtherReceivablesGross
Namespace Prefix:	an_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The aggregate amount of trade receivables, manufacturer receivables and other receivables, reduced to the estimated net realizable fair value by an allowance established of the amount deemed uncertain of collection.

+ References

No definition available.

+ Details

Name:	an_TradeManufacturerAndOtherReceivablesNet
Namespace Prefix:	an_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount due to the company from outside sources, within one year of the balance sheet date, for parts and automotive repair and maintenance services that have been delivered or sold, excluding amounts due from manufacturers. Also includes amounts due from finance organizations, within one year of the balance sheet date, for commissions on the sale of financing products.

+ References

No definition available.

+ Details

Name:	an_TradeReceivables
Namespace Prefix:	an_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amounts of other receivables due within one year of the balance sheet date (or one operating cycle, if longer) from third parties or arising from transactions not separately disclosed.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherReceivablesGrossCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph a

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3,4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5

+ Details

Name:	us-gaap_ReceivablesNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant