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Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 28, 2015	Mar. 29, 2014
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 62.9us-gaap_IncomeTaxExpenseBenefit	$ 52.7us-gaap_IncomeTaxExpenseBenefit
Effective tax rate	30.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations	31.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Consolidated income before provision for income taxes	206.3us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	169.3us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Tax benefits related to acquisition costs, debt redemption costs, restructuring charges and various other items	14.0lea_EffectiveIncomeTaxRateReconciliationIncomeTaxBenefits	9.9lea_EffectiveIncomeTaxRateReconciliationIncomeTaxBenefits
Tax benefits related to reductions in tax reserves due to tax audit settlements		$ 5.5us-gaap_IncomeTaxReconciliationTaxSettlements
U.S. federal statutory income tax rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate

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Effective Income Tax Rate Reconciliation, Income Tax Benefits

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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