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Segment Reporting - Summary of Segment Financial Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 28, 2015		Mar. 29, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenues from external customers	$ 4,521.4us-gaap_SalesRevenueGoodsNet		$ 4,359.8us-gaap_SalesRevenueGoodsNet
Segment earnings	260.7lea_SegmentEarningsLosses		215.3lea_SegmentEarningsLosses
Depreciation and amortization	84.5us-gaap_DepreciationDepletionAndAmortization		74.5us-gaap_DepreciationDepletionAndAmortization
Capital expenditures	98.8us-gaap_PaymentsToAcquirePropertyPlantAndEquipment		96.4us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Total assets	9,618.4us-gaap_Assets	[1]	8,998.2us-gaap_Assets	9,150.2us-gaap_Assets
Operating segments | Seating
Segment Reporting Information [Line Items]
Revenues from external customers	3,485.0us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember		3,225.9us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember
Segment earnings	196.1lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember		152.2lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember
Depreciation and amortization	58.3us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember		47.6us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember
Capital expenditures	71.5us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember		73.9us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember
Total assets	6,314.6us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember		5,417.5us-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	1,036.4us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember		1,133.9us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember
Segment earnings	137.0lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember		138.3lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember
Depreciation and amortization	24.1us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember		25.0us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember
Capital expenditures	25.3us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember		21.6us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember
Total assets	1,689.8us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember		1,808.7us-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
Segment earnings	(72.4)lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember		(75.2)lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember
Depreciation and amortization	2.1us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember		1.9us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember
Capital expenditures	2.0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember		0.9us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember
Total assets	$ 1,614.0us-gaap_Assets / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember		$ 1,772.0us-gaap_Assets / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember
[1] Unaudited.

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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+ References

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-SubTopic 10

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