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Inventory and Vehicle Floorplan Payable (Components of Vehicle Floorplan Payable) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Floorplan Payable [Line Items]
Vehicle floorplan payable	$ 3,097.2an_VehicleFloorplanPayable	$ 3,029.0an_VehicleFloorplanPayable
Trade [Member]
Floorplan Payable [Line Items]
Vehicle floorplan payable	2,090.7an_VehicleFloorplanPayable / an_FloorplanPayableAxis = an_TradeMember	2,130.1an_VehicleFloorplanPayable / an_FloorplanPayableAxis = an_TradeMember
Non-Trade [Member]
Floorplan Payable [Line Items]
Vehicle floorplan payable	$ 1,006.5an_VehicleFloorplanPayable / an_FloorplanPayableAxis = an_NonTradeMember	$ 898.9an_VehicleFloorplanPayable / an_FloorplanPayableAxis = an_NonTradeMember

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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).

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No definition available.

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