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Acquisition - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended			1 Months Ended		0 Months Ended	1 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	May 31, 2012	Nov. 30, 2014	Jan. 05, 2015	Jan. 31, 2015
Business Acquisition [Line Items]
Net sales	$ 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
Guilford Mills
Business Acquisition [Line Items]
Acquisition date												May 31, 2012
Consideration transferred												243.9us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = lea_GuilfordMillsMember
Acquisition related costs											5.0us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = lea_GuilfordMillsMember
Eagle Ottawa
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	350us-gaap_RestrictedCashAndInvestmentsNoncurrent / us-gaap_BusinessAcquisitionAxis = lea_EagleOttawaMember								350us-gaap_RestrictedCashAndInvestmentsNoncurrent / us-gaap_BusinessAcquisitionAxis = lea_EagleOttawaMember
5.25% Senior Notes due 2025
Business Acquisition [Line Items]
Proceeds from issuance of debt													650us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember
5.25% Senior Notes due 2025
Business Acquisition [Line Items]
Long-term debt, stated coupon rate	5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember								5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember
Subsequent event | Eagle Ottawa
Business Acquisition [Line Items]
Business combination, transaction value														850lea_BusinessCombinationTransactionValue / us-gaap_BusinessAcquisitionAxis = lea_EagleOttawaMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Net sales														1,000.0us-gaap_SalesRevenueGoodsNet / us-gaap_BusinessAcquisitionAxis = lea_EagleOttawaMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent event | 5.25% Senior Notes due 2025 | Eagle Ottawa
Business Acquisition [Line Items]
Proceeds from issuance of debt															350us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_BusinessAcquisitionAxis = lea_EagleOttawaMember / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent event | Term Loan Facility | Eagle Ottawa
Business Acquisition [Line Items]
Proceeds from issuance of debt															$ 500us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_BusinessAcquisitionAxis = lea_EagleOttawaMember / us-gaap_DebtInstrumentAxis = lea_TermLoanFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Contractual interest rate for funds borrowed, under the debt agreement.

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