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Financial Instruments - Additional Information (Detail)
3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 0 Months Ended
Mar. 28, 2015
USD ($)
Dec. 31, 2014
EUR (€)
Dec. 31, 2014
USD ($)
Mar. 29, 2014
USD ($)
Dec. 31, 2013
USD ($)
Mar. 28, 2015
Sales
USD ($)
Mar. 29, 2014
Sales
USD ($)
Mar. 28, 2015
Carrying value
USD ($)
Dec. 31, 2014
Carrying value
USD ($)
Mar. 28, 2015
Estimate of fair value
USD ($)
Dec. 31, 2014
Estimate of fair value
USD ($)
Mar. 28, 2015
Interest rate contracts
Designated as hedging instrument
USD ($)
Dec. 31, 2014
Interest rate contracts
Designated as hedging instrument
USD ($)
Mar. 28, 2015
Commodity swap contract
Designated as hedging instrument
USD ($)
Dec. 31, 2014
Commodity swap contract
Designated as hedging instrument
USD ($)
Mar. 28, 2015
Foreign exchange contract
USD ($)
Dec. 31, 2014
Foreign exchange contract
USD ($)
Mar. 28, 2015
Foreign exchange contract
Sales
USD ($)
Mar. 29, 2014
Foreign exchange contract
Sales
USD ($)
Mar. 28, 2015
Foreign exchange contract
Designated as hedging instrument
USD ($)
Dec. 31, 2014
Foreign exchange contract
Designated as hedging instrument
USD ($)
Mar. 28, 2015
Foreign exchange contract
Designated as hedging instrument
Cash flow hedging
USD ($)
Dec. 31, 2014
Foreign exchange contract
Designated as hedging instrument
Cash flow hedging
USD ($)
Mar. 28, 2015
Foreign exchange contract
Not designated as hedging instrument
USD ($)
Dec. 31, 2014
Foreign exchange contract
Not designated as hedging instrument
USD ($)
Jan. 05, 2015
Eagle Ottawa
USD ($)
Jan. 05, 2015
Eagle Ottawa
USD ($)
Financial Instruments [Line Items]                                                      
Long-term Debt               $ 1,975,000,000us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
$ 1,718,700,000us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
$ 2,007,200,000us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
$ 1,749,300,000us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
                               
Uncommitted factoring agreement, aggregate purchases of specified customer accounts (up to)   200,000,000lea_UncommtitedFactoringAgreementAggregatePurchaseofCustomerAccounts                                                  
Notional amount of derivatives                                           1,155,700,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
1,160,900,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
499,600,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
170,100,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
   
Derivative maturities (less than for hedging instruments)                                       21 months       9 months      
Derivative, fair value, asset (liability), net                       0us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
0us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
    (31,900,000)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
(36,600,000)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
    (29,600,000)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
(37,700,000)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
           
Other derivatives not designated as hedging instruments at fair value, net                                               (2,300,000)us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
1,100,000us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
   
Gains (losses) reclassified from accumulated other comprehensive loss           400,000us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesMember
400,000us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesMember
                    (5,100,000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesMember
600,000us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesMember
               
Commodity swap contracts                           0us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
0us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
                       
Pretax gains (losses) related to derivative instruments and hedging activities in accumulated other comprehensive loss (27,500,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax   (33,200,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax (3,400,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax (5,300,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax                             (29,600,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
(37,700,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
           
Gain (loss) expected to be reclassified into earnings from accumulated other comprehensive loss (19,900,000)us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths                                                    
Derivative contracts classified within Level 3 of fair value hierarchy 0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs   0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs                                                
Derivative contracts transfers in to Level 3 fair value hierarchy 0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3                                                    
Property, plant and equipment                                                     141,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= lea_EagleOttawaMember
Intangible assets                                                     211,300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= lea_EagleOttawaMember
Contingent consideration                                                   20,100,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= lea_EagleOttawaMember
 
Assets measured at fair value on non-recurring basis     $ 0us-gaap_AssetsFairValueDisclosureNonrecurring