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Debt - Summary of Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified | Mar. 28, 2015 | Dec. 31, 2014 | Nov. 30, 2014
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Debt Instrument [Line Items] |  |  |  |
Long-term debt, total | $ 1,983.0 us-gaap_DebtAndCapitalLeaseObligations |  | $ 1,718.7 us-gaap_DebtAndCapitalLeaseObligations |
Less — Current portion | (10.6)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent | [1] | (243.7)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent |
Long-term debt | 1,972.4 us-gaap_LongTermDebtAndCapitalLeaseObligations | [1] | 1,475.0 us-gaap_LongTermDebtAndCapitalLeaseObligations |
Other |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, total | 8.0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |  | 0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
Credit Agreement — Term Loan Facility | Term Loan Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, total | 500.0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember |  | 0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember |
Weighted Average Interest Rate | 1.68%us-gaap_DebtWeightedAverageInterestRate / us-gaap_CreditFacilityAxis = lea_TermLoanMember / us-gaap_DebtInstrumentAxis = lea_CreditAgreementTermLoanFacilityMember |  |  |
8.125% Senior Notes due 2020 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, stated coupon rate | 8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 8.125%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Long-term debt, total | 0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 243.7 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Weighted Average Interest Rate |  |  | 8.25%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
4.75% Senior Notes due 2023 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, stated coupon rate | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Long-term debt, total | 500.0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 500.0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Weighted Average Interest Rate | 4.75%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 4.75%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
5.375% Senior Notes due 2024 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, stated coupon rate | 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 5.375%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Long-term debt, total | 325.0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 325.0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Weighted Average Interest Rate | 5.375%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 5.375%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
5.25% Senior Notes due 2025 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, stated coupon rate | 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Long-term debt, total | $ 650.0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | $ 650.0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Weighted Average Interest Rate | 5.25%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 5.25%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
[1] | Unaudited.

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H + Details
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- Definition Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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