XML 24 R47.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Description of Business and Summary of Significant Accounting Policies (Organization and Business, Inventory) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019 brand store franchises
Product Information [Line Items] |
Owned and operated new vehicle franchises | franchises | 317
Number of brands | brand | 32
Percentage of new vehicle sales from core brands (percent) | 92.00%
Dealerships [Member] |
Product Information [Line Items] |
Number of stores | 231
Collision Centers [Member] |
Product Information [Line Items] |
Number of stores | 81
AutoNation USA Stores [Member] |
Product Information [Line Items] |
Number of stores | 5
Automotive Auction Operations [Member] |
Product Information [Line Items] |
Number of stores | 4
Parts Distribution Centers [Member] |
Product Information [Line Items] |
Number of stores | 17

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: |

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

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

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