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Segment Reporting - Summary of Segment Financial Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 31, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenues from external customers	$ 4,549.7us-gaap_SalesRevenueGoodsNet	$ 4,232.7us-gaap_SalesRevenueGoodsNet	$ 4,585.1us-gaap_SalesRevenueGoodsNet	$ 4,359.8us-gaap_SalesRevenueGoodsNet	$ 4,256.1us-gaap_SalesRevenueGoodsNet	$ 3,917.7us-gaap_SalesRevenueGoodsNet	$ 4,113.1us-gaap_SalesRevenueGoodsNet	$ 3,947.1us-gaap_SalesRevenueGoodsNet	$ 17,727.3us-gaap_SalesRevenueGoodsNet		$ 16,234.0us-gaap_SalesRevenueGoodsNet		$ 14,567.0us-gaap_SalesRevenueGoodsNet
Segment earnings									929.2lea_SegmentEarningsLosses	[1]	736.6lea_SegmentEarningsLosses	[1]	705.2lea_SegmentEarningsLosses	[1]
Depreciation and amortization									310.9us-gaap_DepreciationDepletionAndAmortization		285.5us-gaap_DepreciationDepletionAndAmortization		239.5us-gaap_DepreciationDepletionAndAmortization
Capital expenditures									424.7us-gaap_PaymentsToAcquirePropertyPlantAndEquipment		460.6us-gaap_PaymentsToAcquirePropertyPlantAndEquipment		458.3us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Total assets	9,150.2us-gaap_Assets				8,330.9us-gaap_Assets				9,150.2us-gaap_Assets		8,330.9us-gaap_Assets		8,194.1us-gaap_Assets
Operating segments | Seating
Segment Reporting Information [Line Items]
Revenues from external customers									13,310.6us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember		12,018.1us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember		11,029.6us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember
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]
Depreciation and amortization									199.8us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember		181.3us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember		152.6us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember
Capital expenditures									268.9us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember		288.5us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember		290.7us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember
Total assets	4,855.6us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember				4,640.0us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember				4,855.6us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember		4,640.0us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember		4,341.9us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember
Operating segments | Electrical
Segment Reporting Information [Line Items]
Revenues from external customers									4,416.7us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember		4,215.9us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember		3,537.4us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember
Segment earnings									556.6lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember	[1]	414.3lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember	[1]	254.9lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember	[1]
Depreciation and amortization									103.3us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember		96.4us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember		78.4us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember
Capital expenditures									138.4us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember		163.4us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember		158.1us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember
Total assets	1,609.9us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember				1,658.3us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember				1,609.9us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember		1,658.3us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember		1,432.2us-gaap_Assets / 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]
Revenues from external customers									0us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember		0us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember		0us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember
Segment earnings											(254.6)lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember	[1]	(211.4)lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember	[1]
Depreciation and amortization									7.8us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember		7.8us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember		8.5us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember
Capital expenditures									17.4us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember		8.7us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember		9.5us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember
Total assets	$ 2,684.7us-gaap_Assets / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember				$ 2,032.6us-gaap_Assets / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember				$ 2,684.7us-gaap_Assets / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember		$ 2,032.6us-gaap_Assets / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember		$ 2,420.0us-gaap_Assets / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember
[1] (1)See definition in Note 2, "Summary of Significant Accounting Policies — Segment Reporting."

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.

+ Details

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Namespace Prefix:	lea_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 18

-Article 5

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X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ 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

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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