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Acquisitions and Divestitures (Details)	3 Months Ended
	Mar. 31, 2025 store
Domestic Stores Acquired
Business Acquisition [Line Items]
Number of businesses acquired	1
Import Stores Acquired
Business Acquisition [Line Items]
Number of businesses acquired	1

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-5

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

The number of businesses acquired by the entity during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_ConsolidatedEntitiesAxis=an_DomesticStoresAcquiredMember
Namespace Prefix:
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X

- Details

Name:	srt_ConsolidatedEntitiesAxis=an_ImportStoresAcquiredMember
Namespace Prefix:
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Balance Type:
Period Type: