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Commitments and Contingencies - Charge-backs for Various Contracts (Details) $ in Millions | Dec. 31, 2021 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
2022 | $ 67.0
2023 | 19.6
2024 | 7.0
2025 | 2.2
2026 | 0.4
Thereafter | 0.1
Total | $ 96.3

X
- 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
Name: | lad_ChargeBacksFutureMinimumPaymentsDueInFiveYears
Namespace Prefix: | lad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | lad_ChargeBacksFutureMinimumPaymentsDueInFourYears
Namespace Prefix: | lad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | lad_ChargeBacksFutureMinimumPaymentsDueInOneYear
Namespace Prefix: | lad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | lad_ChargeBacksFutureMinimumPaymentsDueInThreeYears
Namespace Prefix: | lad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | lad_ChargeBacksFutureMinimumPaymentsDueInTwoYears
Namespace Prefix: | lad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of liabilities pertaining to charge backs. + References No definition available. + Details
Name: | lad_ChargeBacksLiabilities
Namespace Prefix: | lad_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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