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FLOOR PLAN NOTES PAYABLE - Schedule of Floor Plan Notes Payable (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Payables and Accruals [Abstract] |  |
Floor plan notes payable—trade | $ 345.7 | $ 350.9
Floor plan notes payable offset account | (1.0) | (1.0)
Floor plan notes payable—trade, net | 344.7 | 349.9
Floor plan notes payable—new non-trade | 1,534.9 | 1,359.8
Floor plan notes payable—used non-trade | 350.0 | 100.7
Floor plan notes payable offset account | (107.7) | (115.7)
Floor plan notes payable—non-trade, net | $ 1,777.3 | $ 1,344.8

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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

X
- 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
- 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
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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_PayablesAndAccrualsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration