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Leases - Narrative (Details) $ in Millions	3 Months Ended	9 Months Ended
	Oct. 01, 2022 USD ($)	Oct. 01, 2022 USD ($)
Lessee, Lease, Description
Impairment of right of use assets		$ 6.4
Russia-Ukraine Conflict
Lessee, Lease, Description
Impairment of right of use assets	$ 7.0	7.0
Kongsberg ICS
Lessee, Lease, Description
Right of use asset	34.1	34.1
Lease liability	$ 34.1	$ 34.1

X

- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Lease Liability

+ References

No definition available.

+ Details

Name:	lear_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLeaseLiability
Namespace Prefix:	lear_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Right Of Use Asset

+ References

No definition available.

+ Details

Name:	lear_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAsset
Namespace Prefix:	lear_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of loss from impairment of right-of-use asset from operating lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 25
-Paragraph 6
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=123399704&loc=SL77918431-209957

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=lear_RussiaUkraineConflictMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=lear_KongsbergAutomotivesInteriorComfortDivisionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: