XML 73 R62.htm IDEA: XBRL DOCUMENT
v3.19.1

Segment Information (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 USD ($) segments | Mar. 31, 2018 USD ($) segments
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | segments |  | 3 | 3
Revenues |  | $ 4,981.8 | $ 5,259.9
Segment income |  | 213.1 | 220.8
AN Reportable Segment, Domestic [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues |  | 1,568.8 | 1,773.7
Segment income | [1] | 56.2 | 60.3
AN Reportable Segment, Import [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues |  | 1,496.1 | 1,652.6
Segment income | [1] | 72.6 | 72.8
AN Reportable Segment, Premium Luxury [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues |  | 1,734.1 | 1,717.8
Segment income | [1] | $ 84.3 | $ 87.7
[1] | Segment income represents income for each of our reportable segments and is defined as operating income less floorplan interest expense.

X
- Definition Represents operating income less floorplan interest expense for each of the reportable segments. + References No definition available. + Details
Name: | an_SegmentIncomeLoss
Namespace Prefix: | an_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=an_ANReportableSegmentDomesticMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=an_ANReportableSegmentImportMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=an_ANReportableSegmentPremiumLuxuryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |