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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
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Receivables [Abstract] |  |
Trade receivables | $ 125.1 an_TradeReceivables | $ 125.0 an_TradeReceivables
Manufacturer receivables | 180.4 an_ManufacturerReceivables | 198.3 an_ManufacturerReceivables
Other | 35.1 us-gaap_OtherReceivablesGrossCurrent | 37.9 us-gaap_OtherReceivablesGrossCurrent
Trade, manufacturer and other receivables, gross | 340.6 an_TradeManufacturerAndOtherReceivablesGross | 361.2 an_TradeManufacturerAndOtherReceivablesGross
Less: Allowances | (4.0)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | (3.7)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Trade, manufacturer and other receivables, net | 336.6 an_TradeManufacturerAndOtherReceivablesNet | 357.5 an_TradeManufacturerAndOtherReceivablesNet
Contracts-in-transit and vehicle receivables | 441.4 an_ContractsInTransitAndVehicleReceivables | 460.3 an_ContractsInTransitAndVehicleReceivables
Receivables, net | $ 778.0 us-gaap_ReceivablesNetCurrent | $ 817.8 us-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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant