XML 59 R39.htm IDEA: XBRL DOCUMENT v2.4.1.9

Inventory And Vehicle Floorplan Payable (Components Of Vehicle Floorplan Payable) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Floorplan Payable [Line Items]
Vehicle floorplan payable	$ 3,002.4an_VehicleFloorplanPayable	$ 3,097.2an_VehicleFloorplanPayable
Trade [Member]
Floorplan Payable [Line Items]
Vehicle floorplan payable	2,041.3an_VehicleFloorplanPayable / an_FloorplanPayableAxis = an_TradeMember	2,090.7an_VehicleFloorplanPayable / an_FloorplanPayableAxis = an_TradeMember
Non-Trade [Member]
Floorplan Payable [Line Items]
Vehicle floorplan payable	$ 961.1an_VehicleFloorplanPayable / an_FloorplanPayableAxis = an_NonTradeMember	$ 1,006.5an_VehicleFloorplanPayable / an_FloorplanPayableAxis = an_NonTradeMember

X

- Details

Name:	an_FloorplanPayableLineItems
Namespace Prefix:	an_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amounts borrowed to finance the purchase of specific new vehicle inventories with the corresponding manufacturers' captive finance subsidiaries ("trade lenders") and specific new and, to a lesser extent, used vehicle inventories with non-trade lenders (lenders that are not captive finance subsidiaries of the manufacturer).

+ References

No definition available.

+ Details

Name:	an_VehicleFloorplanPayable
Namespace Prefix:	an_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	an_FloorplanPayableAxis=an_NonTradeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	an_FloorplanPayableAxis=an_TradeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: