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Long-Term Debt and Commercial Paper (Restrictions And Covenants) (Details) - Credit Facility Due 2019 [Member] $ in Millions | Sep. 30, 2016 USD ($)
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Debt Instrument [Line Items] |
Capitalization ratio, requirement | 70.00%
Leverage ratio, requirement | 3.75
The maximum threshold of letters of credit excluded from the leverage ratio calculation | $ 150.0
Capitalization ratio calculation, additions to shareholders' equity | $ 1,530.0

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- Definition Under the credit agreement, the amount added to shareholders' equity in the calculation of the capitalization ratio. + References No definition available. + Details
Name: | an_DebtCovenantCapitalizationRatioCalculationAdditionsToShareholdersEquity
Namespace Prefix: | an_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Under the terms of the credit agreement, the maximum amount of letters of credit excluded from the definition of debt used in the calculation of the leverage ratio. + References No definition available. + Details
Name: | an_DebtCovenantLettersOfCreditExcludedFromDebtLeverageRatioCovenant
Namespace Prefix: | an_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The maximum capitalization ratio required under the company's credit agreement, which is a contractually defined amount principally reflecting vehicle floorplan payable and non-vehicle debt divided by the company's total capitalization including vehicle floorplan payable and certain adjustments. + References No definition available. + Details
Name: | an_DebtInstrumentCovenantTermsMaximumCapitalizationRatio
Namespace Prefix: | an_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The maximum leverage ratio required under the company's credit agreement, which is a contractually defined amount principally reflecting non-vehicle debt divided by a contractually defined measure of earnings with certain adjustments. + References No definition available. + Details
Name: | an_DebtInstrumentCovenantTermsMaximumLeverageRatio
Namespace Prefix: | an_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | us-gaap_DebtInstrumentAxis=an_CreditAgreementDue2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |