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Business And Credit Concentrations (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Risks and Uncertainties [Abstract]
Percentage of new vehicle sales from core brands	94.00%
Manufacturer receivables	$ 213.2	$ 221.4

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.

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No definition available.

+ Details

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X

- Definition

The percentage of new vehicles sold that represent the core brands of new vehicles sold by the company.

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No definition available.

+ Details

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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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