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INVENTORIES AND FLOOR PLAN NOTES PAYABLE - Schedule of Debt (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
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

X

- 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

X

- 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

X

- 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