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Summary of Significant Accounting Policies - Additional information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Segment	Dec. 31, 2013	Dec. 31, 2012
Significant Accounting Policies [Line Items]
Cash equivalents maturity period	90 days
Allowance for doubtful accounts	$ 27.5us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent	$ 34.5us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Reserve of inventory	95.1us-gaap_InventoryValuationReserves	98.8us-gaap_InventoryValuationReserves
Capitalized pre-production E&D costs	232.3lea_PreproductionEngineeringAndDevelopmentCostsRelatedToLongTermSupplyArrangementsCostsCapitalized	202.1lea_PreproductionEngineeringAndDevelopmentCostsRelatedToLongTermSupplyArrangementsCostsCapitalized
Capitalized pre-production tooling costs related to customer-owned tools	177.7lea_PreproductionToolingCostsRelatedToLongTermSupplyArrangementsCostsCapitalized	233.1lea_PreproductionToolingCostsRelatedToLongTermSupplyArrangementsCostsCapitalized
Cash collected related to E&D and tooling costs	395.8lea_RecoveriesOfPreproductionCostsRelatedToLongTermSupplyAgreements	423.9lea_RecoveriesOfPreproductionCostsRelatedToLongTermSupplyAgreements
Depreciation expense	277.2us-gaap_Depreciation	251.1us-gaap_Depreciation	206.6us-gaap_Depreciation
Capital expenditures recorded in accounts payable	112.8us-gaap_CapitalExpendituresIncurredButNotYetPaid	98.9us-gaap_CapitalExpendituresIncurredButNotYetPaid	103.6us-gaap_CapitalExpendituresIncurredButNotYetPaid
Restructuring charges	107.0us-gaap_RestructuringCharges	77.9us-gaap_RestructuringCharges	55.1us-gaap_RestructuringCharges
Fixed asset impairment charges	2.6us-gaap_ImpairmentOfLongLivedAssetsHeldForUse	11.1us-gaap_ImpairmentOfLongLivedAssetsHeldForUse	6.5us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
New product development costs	102.0us-gaap_ResearchAndDevelopmentExpense	108.4us-gaap_ResearchAndDevelopmentExpense	104.3us-gaap_ResearchAndDevelopmentExpense
Foreign currency transaction gain (loss), before tax	(32.1)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	(28.3)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	(11.4)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Reclassification adjustments	0.1us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	15.4us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax	5.4us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
Reportable operating segments	2us-gaap_NumberOfReportableSegments
Corporate and regional headquarters and elimination of intercompany activity ("Other")
Significant Accounting Policies [Line Items]
Fixed asset impairment charges	2.1us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / lea_ImpairmentChargeByTypeAxis = lea_AllOtherMember	1.9us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / lea_ImpairmentChargeByTypeAxis = lea_AllOtherMember	0.5us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / lea_ImpairmentChargeByTypeAxis = lea_AllOtherMember
Asset impairments
Significant Accounting Policies [Line Items]
Restructuring charges	0.5us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = lea_AssetImpairmentChargeMember	9.2us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = lea_AssetImpairmentChargeMember	6.0us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = lea_AssetImpairmentChargeMember
Designated as hedging instrument | Foreign exchange contract
Significant Accounting Policies [Line Items]
(Gains) losses reclassified from accumulated other comprehensive loss	(8.2)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	(32.2)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	3.2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Restructuring charges excluding pension opeb charges
Significant Accounting Policies [Line Items]
Restructuring charges	$ 107.0us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember	$ 75.4us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember	$ 55.1us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember

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Amount of recoverable preproduction engineering and design costs related to long term supply agreements capitalized during the reporting period.

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Amount of recoverable preproduction tooling costs related to long term supply agreements capitalized during the reporting period.

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Cash recoveries of preproduction engineering, design and tooling costs incurred on behalf of a customer.

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Amount of valuation reserve for inventory.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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