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Inventory And Vehicle Floorplan Payable (Components Of Vehicle Floorplan Payable) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Floorplan Payable [Line Items]
Vehicle floorplan payable	$ 3,805.2	$ 3,382.4
Trade
Floorplan Payable [Line Items]
Vehicle floorplan payable	2,224.8	1,760.0
Non-Trade
Floorplan Payable [Line Items]
Vehicle floorplan payable	$ 1,580.4	$ 1,622.4

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- Definition

Floorplan Payable [Line Items]

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No definition available.

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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).

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No definition available.

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

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- Details

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

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- Details

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