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Quarterly Financial Data - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended			3 Months Ended					0 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 31, 2013	Jun. 29, 2013	Aug. 24, 2012
Quarterly Financial Information [Line Items]
Losses related to redemption of remaining aggregate principal	$ 17.5us-gaap_GainsLossesOnExtinguishmentOfDebt	$ 17.9us-gaap_GainsLossesOnExtinguishmentOfDebt	$ 3.6us-gaap_GainsLossesOnExtinguishmentOfDebt	$ 3.7us-gaap_GainsLossesOnExtinguishmentOfDebt
Provision (benefit) for income taxes		121.4us-gaap_IncomeTaxExpenseBenefit	192.7us-gaap_IncomeTaxExpenseBenefit	(638.0)us-gaap_IncomeTaxExpenseBenefit
Valuation allowance of deferred tax assets and other items
Quarterly Financial Information [Line Items]
Provision (benefit) for income taxes	(108.9)us-gaap_IncomeTaxExpenseBenefit / lea_IncomeTaxesAxis = lea_ValuationAllowanceOfDeferredTaxAssetsAndOtherItemsMember				(6.9)us-gaap_IncomeTaxExpenseBenefit / lea_IncomeTaxesAxis = lea_ValuationAllowanceOfDeferredTaxAssetsAndOtherItemsMember	(17.9)us-gaap_IncomeTaxExpenseBenefit / lea_IncomeTaxesAxis = lea_ValuationAllowanceOfDeferredTaxAssetsAndOtherItemsMember	(15.4)us-gaap_IncomeTaxExpenseBenefit / lea_IncomeTaxesAxis = lea_ValuationAllowanceOfDeferredTaxAssetsAndOtherItemsMember	16.0us-gaap_IncomeTaxExpenseBenefit / lea_IncomeTaxesAxis = lea_ValuationAllowanceOfDeferredTaxAssetsAndOtherItemsMember	(21.5)us-gaap_IncomeTaxExpenseBenefit / lea_IncomeTaxesAxis = lea_ValuationAllowanceOfDeferredTaxAssetsAndOtherItemsMember
2018 notes
Quarterly Financial Information [Line Items]
Losses related to redemption of remaining aggregate principal							$ 17.5us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwentyEighteenMember
8.125% Senior Notes due 2020
Quarterly Financial Information [Line Items]
Percentage of debt redemption							10.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember			10.00%us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

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

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