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Segment Reporting - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Restructuring charges | $ 107.0 us-gaap_RestructuringCharges | $ 77.9 us-gaap_RestructuringCharges | $ 55.1 us-gaap_RestructuringCharges
Operating segments | Seating |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring charges | 84.0 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember | 54.8 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember | 47.8 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember
Operating segments | Electrical |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring charges | 10.3 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember | 13.1 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember | 4.3 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember
Corporate and regional headquarters and elimination of intercompany activity ("Other") |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring charges | $ 12.7 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember | $ 10.0 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember | $ 3.1 us-gaap_RestructuringCharges / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |