XML 58 R36.htm IDEA: XBRL DOCUMENT
v3.19.3

Interim Financial Statements (Business and Basis of Presentation) (Details) | 9 Months Ended
--- | ---
Sep. 30, 2019 brand store franchises
Product Information [Line Items] |
Owned and operated new vehicle franchises | franchises | 319
Number of stores (approximate number for total locations) | 325
Number of brands | brand | 31
Percentage of new vehicle sales from core brands (percent) | 92.00%
Dealerships [Member] |
Product Information [Line Items] |
Number of stores (approximate number for total locations) | 233
Collision Centers [Member] |
Product Information [Line Items] |
Number of stores (approximate number for total locations) | 82

X
- Definition The number of new vehicle brands sold by the company's stores. + References No definition available. + Details
Name: | an_NumberOfBrands
Namespace Prefix: | an_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of owned and operated new vehicle franchises. + References No definition available. + Details
Name: | an_OwnedAndOperatedNewVehicleFranchises
Namespace Prefix: | an_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of new vehicles sold that represent the core brands of new vehicles sold by the company. + References No definition available. + Details
Name: | an_PercentageOfNewVehicleSalesCoreBrands
Namespace Prefix: | an_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of stores. + References No definition available. + Details
Name: | us-gaap_NumberOfStores
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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_ProductInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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_CollisionCentersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |