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Debt - Summary of Long-Term Debt and Related Weighted Average Interest Rates (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt	$ 1,475.0us-gaap_UnsecuredLongTermDebt	$ 1,057.1us-gaap_UnsecuredLongTermDebt
Less — Current portion	(243.7)us-gaap_LongTermDebtCurrent	0us-gaap_LongTermDebtCurrent
Long-term debt	1,475.0us-gaap_LongTermDebt	1,057.1us-gaap_LongTermDebt
7.875% Senior Notes due 2018
Debt Instrument [Line Items]
Long-term debt	0us-gaap_UnsecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandEighteenMember	278.8us-gaap_UnsecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandEighteenMember
Weighted Average Interest Rate		8.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandEighteenMember
8.125% Senior Notes due 2020
Debt Instrument [Line Items]
Long-term debt	243.7us-gaap_UnsecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember	278.3us-gaap_UnsecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember
Weighted Average Interest Rate	8.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember	8.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyMember
4.75% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term debt	500.0us-gaap_UnsecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember	500.0us-gaap_UnsecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember
Weighted Average Interest Rate	4.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember	4.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyThreeMember
5.375% Senior Notes due 2024
Debt Instrument [Line Items]
Long-term debt	325.0us-gaap_UnsecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember	0us-gaap_UnsecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember
Weighted Average Interest Rate	5.375%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFourMember
5.25% Senior Notes due 2025
Debt Instrument [Line Items]
Long-term debt	$ 650.0us-gaap_UnsecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember	$ 0us-gaap_UnsecuredLongTermDebt / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember
Weighted Average Interest Rate	5.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = lea_SeniorNotesDueTwoThousandTwentyFiveMember

X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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