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

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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
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Balance Type: | credit
Period Type: | instant

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