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INVENTORIES AND FLOOR PLAN NOTES PAYABLE - Schedule of Debt (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Inventory Disclosure [Abstract] |  |
Floor plan notes payable | $ 1,964.1 | $ 2,055.1
Floor plan notes payable: non-trade | 2,904.8 | 2,848.0
Total floor plan debt | $ 4,868.9 | $ 4,903.1

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- Definition Floor Plan Debt + References No definition available. + Details
Name: | lad_FloorPlanDebt
Namespace Prefix: | lad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of notes payable attributable to the floor plan. + References No definition available. + Details
Name: | lad_FloorPlanNotesPayable
Namespace Prefix: | lad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amounts borrowed to finance the purchase of specific new and program vehicle inventories with lenders that are not captive finance subsidiaries of the manufacturer. + References No definition available. + Details
Name: | lad_FloorPlanNotesPayableNonTrade
Namespace Prefix: | lad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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