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v2.4.1.9

Summary of Significant Accounting Policies - Summary of Changes in Carrying Amount of Goodwill (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Goodwill [Line Items] |  |
Ending balance | $ 726.2 us-gaap_Goodwill | $ 757.2 us-gaap_Goodwill
Seating |  |
Goodwill [Line Items] |  |
Beginning balance | 757.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember | 746.5 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember
Foreign currency translation and other | (31.0)lea_GoodwillTranslationAdjustmentsAndOtherChanges / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember | 10.7 lea_GoodwillTranslationAdjustmentsAndOtherChanges / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember
Ending balance | $ 726.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember | $ 757.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember

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- Definition Goodwill Translation Adjustments and Other Changes + References No definition available. + Details
Name: | lea_GoodwillTranslationAdjustmentsAndOtherChanges
Namespace Prefix: | lea_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=lea_SeatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |