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FLOOR PLAN NOTES PAYABLE—TRADE (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Disclosure [Abstract]
Floor plan notes payable—trade	$ 350.9	$ 245.6
Floor plan notes payable offset account	(1.0)	(50.5)
Total floor plan notes payable—trade, net	$ 349.9	$ 195.1

X

- Definition

Amounts borrowed to finance the purchase of specific new vehicle inventories with the corresponding manufacturers' captive finance subsidiaries ("trade lenders").

+ References

No definition available.

+ Details

Name:	abg_FloorPlanNotesPayableTrade
Namespace Prefix:	abg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Floor Plan Notes Payable Trade, Gross

+ References

No definition available.

+ Details

Name:	abg_FloorPlanNotesPayableTradeGross
Namespace Prefix:	abg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Floor Plan Notes Payable Trade, Offsets

+ References

No definition available.

+ Details

Name:	abg_FloorPlanNotesPayableTradeOffsets
Namespace Prefix:	abg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_DebtDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration