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FLOOR PLAN NOTES PAYABLE—NON-TRADE - Consist of (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Debt Disclosure [Abstract] |  |
Floor plan notes payable—new non-trade | $ 1,359.8 | $ 1,328.1
Floor plan notes payable—used non-trade | 100.7 | 307.1
Floor plan notes payable offset account | (115.7) | (44.7)
Total floor plan notes payable—non-trade, net | $ 1,344.8 | $ 1,590.6

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- Definition Amounts borrowed to finance the purchase of 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: | abg_FloorPlanNotesPayableNonTrade
Namespace Prefix: | abg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Floor Plan Notes Payable Non Trade, New, Gross + References No definition available. + Details
Name: | abg_FloorPlanNotesPayableNonTradeNewGross
Namespace Prefix: | abg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Floor Plan Notes Payable Non Trade, Offsets + References No definition available. + Details
Name: | abg_FloorPlanNotesPayableNonTradeOffsets
Namespace Prefix: | abg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Floor Plan Notes Payable Non Trade, Used, Gross + References No definition available. + Details
Name: | abg_FloorPlanNotesPayableNonTradeUsedGross
Namespace Prefix: | abg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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