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v3.21.2

Acquisitions and Divestitures (Details) |  | 9 Months Ended
--- | --- | ---
Oct. 18, 2021 store | Sep. 30, 2021 store | Sep. 30, 2020 store franchises
Business Acquisition [Line Items] |  |  |
Number of Franchises Terminated | franchises |  |  | 1
Dealerships [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of Businesses Acquired |  | 11 |
Number of Business Divested |  | 2 | 1
Collision Centers [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of Businesses Acquired |  | 1 |
Number of Business Divested |  | 3 |
Collision Centers [Member] | Subsequent Event [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of Stores Announced to be Divested | 17 |  |

X
- Definition The number of business divested during the period. + References No definition available. + Details
Name: | an_NumberOfBusinessDivested
Namespace Prefix: | an_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of franchises terminated during the period. + References No definition available. + Details
Name: | an_NumberOfFranchisesTerminated
Namespace Prefix: | an_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of stores that the company has announced will be divested in a future period. + References No definition available. + Details
Name: | an_NumberOfStoresAnnouncedToBeDivested
Namespace Prefix: | an_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=an_DealershipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=an_CollisionCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |