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Leases - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) lease_contract | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Lessee, Lease, Description [Line Items] |  |  |
Number of lease contracts | lease_contract | 2 |  |
Lease not yet commenced | $ 62.0 |  |
Rent expense |  | $ 163.8 | $ 144.7
Right-of-use asset, impairment | $ 0.8 |  |
Minimum | Lease one |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lease not yet commenced, term of contract | 7 years |  |
Maximum | Lease two |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lease not yet commenced, term of contract | 10 years |  |

X
- Definition Lessee, Operating Lease, Lease Not yet Commenced + References No definition available. + Details
Name: | lear_LesseeOperatingLeaseLeaseNotyetCommenced
Namespace Prefix: | lear_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessee, Operating Lease, Lease Not yet Commenced, Number Of Contracts + References No definition available. + Details
Name: | lear_LesseeOperatingLeaseLeaseNotyetCommencedNumberOfContracts
Namespace Prefix: | lear_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Right-of-Use Asset, Impairment + References No definition available. + Details
Name: | lear_RightofUseAssetImpairment
Namespace Prefix: | lear_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

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- Definition Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
Name: | us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=lear_LeaseOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=lear_LeaseTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |