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Segment Reporting - Reconciliation of Consolidated Segment Earnings to Consolidated Income Before Provision for Income Taxes (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, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Segment earnings | $ 929.2 lea_SegmentEarningsLosses | [1] | $ 736.6 lea_SegmentEarningsLosses | [1] | $ 705.2 lea_SegmentEarningsLosses | [1]
Interest expense | 67.5 us-gaap_InterestExpense |  | 68.4 us-gaap_InterestExpense |  | 49.9 us-gaap_InterestExpense |
Other expense, net | 74.3 lea_OtherIncomeExpenseNet |  | 58.1 lea_OtherIncomeExpenseNet |  | 6.4 lea_OtherIncomeExpenseNet |
Consolidated income before provision (benefit) for income taxes and equity in net income of affiliates | 787.4 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 610.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 648.9 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
Corporate and regional headquarters and elimination of intercompany activity ("Other") |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Segment earnings |  |  | (254.6)lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember | [1] | (211.4)lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember | [1]
Seating and Electrical |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Segment earnings | 1,211.8 lea_SegmentEarningsLosses / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember |  | 991.2 lea_SegmentEarningsLosses / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember |  | 916.6 lea_SegmentEarningsLosses / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember |
Corporate and regional headquarters and elimination of intercompany activity | (282.6)lea_Corporateandregionalheadquartersandeliminationofintercompanyactivity / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember | [1] | (254.6)lea_Corporateandregionalheadquartersandeliminationofintercompanyactivity / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember |  | (211.4)lea_Corporateandregionalheadquartersandeliminationofintercompanyactivity / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember |
Consolidated income before interest, other expense, provision (benefit) for income taxes and equity in net income of affiliates | 929.2 lea_Consolidatedincomebeforeinterestotherexpenseprovisionbenefitforincometaxesandequityinnetincomeofaffiliates / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember |  | 736.6 lea_Consolidatedincomebeforeinterestotherexpenseprovisionbenefitforincometaxesandequityinnetincomeofaffiliates / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember |  | 705.2 lea_Consolidatedincomebeforeinterestotherexpenseprovisionbenefitforincometaxesandequityinnetincomeofaffiliates / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember |
Interest expense | 67.5 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember |  | 68.4 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember |  | 49.9 us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember |
Other expense, net | 74.3 lea_OtherIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember |  | 58.1 lea_OtherIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember |  | 6.4 lea_OtherIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember |
Consolidated income before provision (benefit) for income taxes and equity in net income of affiliates | 787.4 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember |  | 610.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember |  | 648.9 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember |
Seating | Operating segments |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Segment earnings | $ 655.2 lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember | [1] | $ 576.9 lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember | [1] | $ 661.7 lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember | [1]
[1] | (1)See definition in Note 2, "Summary of Significant Accounting Policies — Segment Reporting."

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- Definition Consolidated income before interest, other expense, provision (benefit) for income taxes and equity in net income of affiliates + References No definition available. + Details
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- Definition Amount of pretax income or loss for the reportable segment before interest, other (income) expense, provision (benefit) for income taxes and equity in net (income) loss of affiliates. + References No definition available. + Details
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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 + Details
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