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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
	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	$ 929.2lea_SegmentEarningsLosses	[1]	$ 736.6lea_SegmentEarningsLosses	[1]	$ 705.2lea_SegmentEarningsLosses	[1]
Interest expense	67.5us-gaap_InterestExpense		68.4us-gaap_InterestExpense		49.9us-gaap_InterestExpense
Other expense, net	74.3lea_OtherIncomeExpenseNet		58.1lea_OtherIncomeExpenseNet		6.4lea_OtherIncomeExpenseNet
Consolidated income before provision (benefit) for income taxes and equity in net income of affiliates	787.4us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		610.1us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments		648.9us-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	1,211.8lea_SegmentEarningsLosses / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember		991.2lea_SegmentEarningsLosses / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember		916.6lea_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	929.2lea_Consolidatedincomebeforeinterestotherexpenseprovisionbenefitforincometaxesandequityinnetincomeofaffiliates / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember		736.6lea_Consolidatedincomebeforeinterestotherexpenseprovisionbenefitforincometaxesandequityinnetincomeofaffiliates / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember		705.2lea_Consolidatedincomebeforeinterestotherexpenseprovisionbenefitforincometaxesandequityinnetincomeofaffiliates / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember
Interest expense	67.5us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember		68.4us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember		49.9us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember
Other expense, net	74.3lea_OtherIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember		58.1lea_OtherIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember		6.4lea_OtherIncomeExpenseNet / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember
Consolidated income before provision (benefit) for income taxes and equity in net income of affiliates	787.4us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember		610.1us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingandElectricalMember		648.9us-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	$ 655.2lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember	[1]	$ 576.9lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember	[1]	$ 661.7lea_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."

X

- Definition

Consolidated income before interest, other expense, provision (benefit) for income taxes and equity in net income of affiliates

+ References

No definition available.

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- Definition

Corporate and regional headquarters and elimination of intercompany activity

+ References

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- Definition

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+ References

No definition available.

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X

- 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.

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X

- 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

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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

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