Commitments and Contingencies - Schedule of Charge-backs for Various Contracts (Details) $ in Millions	Dec. 31, 2024 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2025	$ 98.0
2026	47.8
2027	20.7
2028	6.9
2029	1.5
Thereafter	0.1
Total	$ 175.0

- Definition

Amount of estimated contractual obligations to be paid in the fifth fiscal year following the latest fiscal year related to the cancellation of various contracts

+ References

No definition available.

+ Details

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- Definition

Amount of estimated contractual obligations to be paid in the fourth fiscal year following the latest fiscal year related to the cancellation of various contracts

+ References

No definition available.

+ Details

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- Definition

Amount of estimated contractual obligations to be paid in the next fiscal year following the latest fiscal year related to the cancellation of various contracts.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Amount of estimated contractual obligations to be paid in the third fiscal year following the latest fiscal year related to the cancellation of various contracts.

+ References

No definition available.

+ Details

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Namespace Prefix:	lad_
Data Type:	xbrli:monetaryItemType
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- Definition

Amount of estimated contractual obligations to be paid in the second fiscal year following the latest fiscal year related to the cancellation of various contracts.

+ References

No definition available.

+ Details

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Namespace Prefix:	lad_
Data Type:	xbrli:monetaryItemType
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- Definition

Amount of estimated contractual obligations to be paid after the fifth fiscal year following the latest fiscal year related to the cancellation of various contracts.

+ References

No definition available.

+ Details

Name:	lad_ChargeBacksFutureMinimumPaymentsDueThereafter
Namespace Prefix:	lad_
Data Type:	xbrli:monetaryItemType
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- Definition

The amount of liabilities pertaining to charge backs.

+ References

No definition available.

+ Details

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Namespace Prefix:	lad_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- References

No definition available.

+ Details

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