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Inventory And Vehicle Floorplan Payable (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Floorplan Payable [Line Items] |  |  |
Vehicle floorplan facilities, amount outstanding | $ 3,002.4 an_VehicleFloorplanPayable |  | $ 3,097.2 an_VehicleFloorplanPayable
Used vehicle floorplan facilities, remaining borrowing capacity | 132.9 an_UsedVehicleFloorplanFacilityRemainingBorrowingCapacity |  |
Used vehicle floorplan facilities, current borrowing capacity | 107.1 an_UsedVehicleFloorplanFacilityCurrentBorrowingCapacity |  |
Used Vehicle Floorplan Facilities [Member] |  |  |
Floorplan Payable [Line Items] |  |  |
Vehicle floorplan facilities, average LIBOR-based interest rates | 1.70%an_VehicleFloorplanFacilityInterestRateDuringPeriod / an_FloorplanFacilitiesNewVehicleUsedVehicleAxis = an_UsedVehicleFloorplanFacilitiesMember | 1.70%an_VehicleFloorplanFacilityInterestRateDuringPeriod / an_FloorplanFacilitiesNewVehicleUsedVehicleAxis = an_UsedVehicleFloorplanFacilitiesMember |
Vehicle floorplan facilities, maximum borrowing capacity | 315.0 an_VehicleFloorplanFacilityMaximumBorrowingCapacity / an_FloorplanFacilitiesNewVehicleUsedVehicleAxis = an_UsedVehicleFloorplanFacilitiesMember |  |
Vehicle floorplan facilities, amount outstanding | 182.1 an_VehicleFloorplanPayable / an_FloorplanFacilitiesNewVehicleUsedVehicleAxis = an_UsedVehicleFloorplanFacilitiesMember |  |
New Vehicle Floorplan Facilities [Member] |  |  |
Floorplan Payable [Line Items] |  |  |
Vehicle floorplan facilities, average LIBOR-based interest rates | 1.70%an_VehicleFloorplanFacilityInterestRateDuringPeriod / an_FloorplanFacilitiesNewVehicleUsedVehicleAxis = an_NewVehicleFloorplanFacilitiesMember | 1.80%an_VehicleFloorplanFacilityInterestRateDuringPeriod / an_FloorplanFacilitiesNewVehicleUsedVehicleAxis = an_NewVehicleFloorplanFacilitiesMember |
Vehicle floorplan facilities, maximum borrowing capacity | 3,800.0 an_VehicleFloorplanFacilityMaximumBorrowingCapacity / an_FloorplanFacilitiesNewVehicleUsedVehicleAxis = an_NewVehicleFloorplanFacilitiesMember |  |
Vehicle floorplan facilities, amount outstanding | $ 2,800.0 an_VehicleFloorplanPayable / an_FloorplanFacilitiesNewVehicleUsedVehicleAxis = an_NewVehicleFloorplanFacilitiesMember |  |

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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 Amount of current borrowing capacity under used vehicle floorplan facilities considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of eligible used vehicle inventory that could have been pledged as collateral) and any amounts currently outstanding under the facility. + References No definition available. + Details
Name: | an_UsedVehicleFloorplanFacilityCurrentBorrowingCapacity
Namespace Prefix: | an_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under used vehicle floorplan facilities (maximum borrowing capacity less the amount of borrowings outstanding). + References No definition available. + Details
Name: | an_UsedVehicleFloorplanFacilityRemainingBorrowingCapacity
Namespace Prefix: | an_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The average effective interest rate of vehicle floorplan facilities during the reporting period. + References No definition available. + Details
Name: | an_VehicleFloorplanFacilityInterestRateDuringPeriod
Namespace Prefix: | an_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The aggregate maximum borrowing capacity under new and used vehicle floorplan facilities without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facilities. + References No definition available. + Details
Name: | an_VehicleFloorplanFacilityMaximumBorrowingCapacity
Namespace Prefix: | an_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | an_FloorplanFacilitiesNewVehicleUsedVehicleAxis=an_UsedVehicleFloorplanFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |