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FLOOR PLAN NOTES PAYABLE—TRADE (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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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

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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"). + References No definition available. + Details
Name: | abg_FloorPlanNotesPayableTrade
Namespace Prefix: | abg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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- 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

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- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration