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Business And Credit Concentrations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Risks and Uncertainties [Abstract]
Percentage of total retail new vehicle unit sales from stores located in Florida, Texas and California	64.00%
Percentage of new vehicle sales from core brands (percent)	92.00%
Manufacturer receivables	$ 198.5	$ 242.3

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

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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:	num: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:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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