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Acquisition - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Jan. 05, 2015
Nov. 30, 2014
Nov. 30, 2014
Dec. 31, 2014
Business Acquisition [Line Items]            
Annual sales $ 4,521.4us-gaap_SalesRevenueGoodsNet $ 4,359.8us-gaap_SalesRevenueGoodsNet        
Term loan facility borrowings 500.0us-gaap_ProceedsFromRepaymentsOfOtherDebt 0us-gaap_ProceedsFromRepaymentsOfOtherDebt        
Eagle Ottawa            
Business Acquisition [Line Items]            
Percentage of outstanding equity interests acquired     100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
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Net purchase price     843.4us-gaap_BusinessCombinationConsiderationTransferred1
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Cash paid     823.3us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
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Contingent consideration     20.1us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
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Restricted cash used to finance the acquisition     350lea_RestrictedCashDisbursementstoAcquireBusinessesGross
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Contingent consideration     23.1us-gaap_BusinessCombinationLiabilitiesArisingFromContingenciesAmountRecognized
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Intangible assets acquired, weighted average useful life 10 years          
Credit Agreement — Term Loan Facility            
Business Acquisition [Line Items]            
Term loan facility borrowings     500.0us-gaap_ProceedsFromRepaymentsOfOtherDebt
/ us-gaap_DebtInstrumentAxis
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Eagle Ottawa            
Business Acquisition [Line Items]            
Annual sales       1,000.0us-gaap_SalesRevenueGoodsNet
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Sales to Lear       200us-gaap_RevenueFromRelatedParties
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Pre-existing amounts payable for purchases of raw materials | Eagle Ottawa            
Business Acquisition [Line Items]            
Amounts payable to acquiree for purchases of raw materials as of the acquisition date     45.7us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCosts
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Selling, general and administrative expenses | Eagle Ottawa            
Business Acquisition [Line Items]            
Transaction costs 8.4us-gaap_BusinessCombinationAcquisitionRelatedCosts
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Senior notes | 5.25% Senior Notes due 2025            
Business Acquisition [Line Items]            
Proceeds from offering         $ 650us-gaap_ProceedsFromIssuanceOfLongTermDebt
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Long-term debt, stated coupon rate 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
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    5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= lea_SeniorNotesDueTwoThousandTwentyFiveMember
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5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= lea_SeniorNotesDueTwoThousandTwentyFiveMember
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5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
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= lea_SeniorNotesDueTwoThousandTwentyFiveMember
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