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Inventory And Vehicle Floorplan Payable (Components Of Vehicle Floorplan Payable) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Floorplan Payable [Line Items] |  |
Vehicle floorplan payable | $ 2,774.7 | $ 3,029.0
Trade [Member] |  |
Floorplan Payable [Line Items] |  |
Vehicle floorplan payable | 1,912.6 | 2,130.1
Non-Trade [Member] |  |
Floorplan Payable [Line Items] |  |
Vehicle floorplan payable | $ 862.1 | $ 898.9

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

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- 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