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Business and Credit Concentrations (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Risks and Uncertainties [Abstract] |  |
Percentage Revenue from stores located in Florida, Texas, California | 65.00% |
Manufacturer receivables | $ 148.4 | $ 210.0
Percentage of new vehicle sales from core brands (percent) | 90.00% |

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 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: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of total revenue generated by stores located in Florida, Texas, and California. + References No definition available. + Details
Name: | an_PercentageofRevenueCertainStates
Namespace Prefix: | an_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RisksAndUncertaintiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration