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Supplemental Guarantor Condensed Consolidating Financial Statements - Cash Flows (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 51 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Mar. 28, 2015
Condensed Financial Statements, Captions [Line Items]      
Net Cash Used in Operating Activities $ (66.6)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations $ (54.2)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations  
Cash Flows from Investing Activities:      
Additions to property, plant and equipment (98.8)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (96.4)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment  
Acquisition of Eagle Ottawa, net of cash acquired and use of $350 million restricted cash (see non-cash investing activities below) (Note 2) (473.3)lea_PaymentstoAcquireBusinessesNetofCashAcquiredandRestrictedCash 0lea_PaymentstoAcquireBusinessesNetofCashAcquiredandRestrictedCash  
Intercompany transactions 0lea_IntercompanyTransactionsProceedsFromPaymentsForInvesting 0lea_IntercompanyTransactionsProceedsFromPaymentsForInvesting  
Other, net 7.9us-gaap_PaymentsForProceedsFromOtherInvestingActivities (14.0)us-gaap_PaymentsForProceedsFromOtherInvestingActivities  
Net cash used in investing activities (564.2)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (110.4)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations  
Cash Flows from Financing Activities:      
Proceeds from the issuance of senior notes 0us-gaap_ProceedsFromIssuanceOfUnsecuredDebt 325.0us-gaap_ProceedsFromIssuanceOfUnsecuredDebt  
Credit agreement borrowings 500.0us-gaap_ProceedsFromRepaymentsOfOtherDebt 0us-gaap_ProceedsFromRepaymentsOfOtherDebt  
Repurchase of senior notes, net of use of $250 million restricted cash in 2015 (see non-cash financing activities below) (Note 8) (5.0)lea_EarlyRepaymentofSeniorDebtNetofRestrictedCashDisbursement (327.1)lea_EarlyRepaymentofSeniorDebtNetofRestrictedCashDisbursement  
Payment of debt issuance and other financing costs 0us-gaap_PaymentsOfDebtIssuanceCosts (3.8)us-gaap_PaymentsOfDebtIssuanceCosts  
Repurchase of common stock (112.4)us-gaap_PaymentsForRepurchaseOfCommonStock 0us-gaap_PaymentsForRepurchaseOfCommonStock (2,000.0)us-gaap_PaymentsForRepurchaseOfCommonStock
Dividends paid to Lear Corporation stockholders (22.0)us-gaap_PaymentsOfDividendsCommonStock (17.5)us-gaap_PaymentsOfDividendsCommonStock  
Dividends paid to noncontrolling interests (0.1)us-gaap_PaymentsOfDividendsMinorityInterest (5.8)us-gaap_PaymentsOfDividendsMinorityInterest  
Intercompany transactions 0lea_IntercompanyTransactionsProceedsFromPaymentsForFinancing 0lea_IntercompanyTransactionsProceedsFromPaymentsForFinancing  
Other, net (46.0)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (21.1)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities  
Net cash provided by (used in) financing activities 314.5us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (50.3)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations  
Effect of foreign currency translation (29.6)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (3.4)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents  
Net Change in Cash and Cash Equivalents (345.9)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (218.3)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease  
Cash and Cash Equivalents as of Beginning of Period 1,094.1us-gaap_CashAndCashEquivalentsAtCarryingValue 1,137.7us-gaap_CashAndCashEquivalentsAtCarryingValue  
Cash and Cash Equivalents as of End of Period 748.2us-gaap_CashAndCashEquivalentsAtCarryingValue [1] 919.4us-gaap_CashAndCashEquivalentsAtCarryingValue 748.2us-gaap_CashAndCashEquivalentsAtCarryingValue [1]
Cash restricted for use — acquisition of Eagle Ottawa (350.0)lea_RestrictedCashDisbursementstoAcquireBusiness 0lea_RestrictedCashDisbursementstoAcquireBusiness  
Cash restricted for use — repurchase of senior notes (250.0)lea_RestrictedCashDisbursementsforRepaymentsofSeniorDebt 0lea_RestrictedCashDisbursementsforRepaymentsofSeniorDebt  
Parent company      
Condensed Financial Statements, Captions [Line Items]      
Net Cash Used in Operating Activities 9.2us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
17.0us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Cash Flows from Investing Activities:      
Additions to property, plant and equipment (3.7)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(1.5)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Acquisition of Eagle Ottawa, net of cash acquired and use of $350 million restricted cash (see non-cash investing activities below) (Note 2) (493.5)lea_PaymentstoAcquireBusinessesNetofCashAcquiredandRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Intercompany transactions (42.0)lea_IntercompanyTransactionsProceedsFromPaymentsForInvesting
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(179.1)lea_IntercompanyTransactionsProceedsFromPaymentsForInvesting
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Other, net (2.3)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0.2us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Net cash used in investing activities (541.5)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(180.4)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Cash Flows from Financing Activities:      
Proceeds from the issuance of senior notes   325.0us-gaap_ProceedsFromIssuanceOfUnsecuredDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Credit agreement borrowings 500.0us-gaap_ProceedsFromRepaymentsOfOtherDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Repurchase of senior notes, net of use of $250 million restricted cash in 2015 (see non-cash financing activities below) (Note 8) (5.0)lea_EarlyRepaymentofSeniorDebtNetofRestrictedCashDisbursement
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(327.1)lea_EarlyRepaymentofSeniorDebtNetofRestrictedCashDisbursement
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Payment of debt issuance and other financing costs   (3.8)us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Repurchase of common stock (112.4)us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Dividends paid to Lear Corporation stockholders (22.0)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(17.5)us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Dividends paid to noncontrolling interests 0us-gaap_PaymentsOfDividendsMinorityInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_PaymentsOfDividendsMinorityInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Intercompany transactions 41.7lea_IntercompanyTransactionsProceedsFromPaymentsForFinancing
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
82.9lea_IntercompanyTransactionsProceedsFromPaymentsForFinancing
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Other, net (48.0)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(18.9)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Net cash provided by (used in) financing activities 354.3us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
40.6us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Effect of foreign currency translation 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Net Change in Cash and Cash Equivalents (178.0)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(122.8)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Cash and Cash Equivalents as of Beginning of Period 377.8us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
343.5us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Cash and Cash Equivalents as of End of Period 199.8us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
220.7us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
199.8us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash restricted for use — acquisition of Eagle Ottawa (350.0)lea_RestrictedCashDisbursementstoAcquireBusiness
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Cash restricted for use — repurchase of senior notes (250.0)lea_RestrictedCashDisbursementsforRepaymentsofSeniorDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Guarantor subsidiaries      
Condensed Financial Statements, Captions [Line Items]      
Net Cash Used in Operating Activities (179.4)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(125.9)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Cash Flows from Investing Activities:      
Additions to property, plant and equipment (22.5)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(21.4)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Acquisition of Eagle Ottawa, net of cash acquired and use of $350 million restricted cash (see non-cash investing activities below) (Note 2) 0lea_PaymentstoAcquireBusinessesNetofCashAcquiredandRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Intercompany transactions (1.7)lea_IntercompanyTransactionsProceedsFromPaymentsForInvesting
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(12.4)lea_IntercompanyTransactionsProceedsFromPaymentsForInvesting
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Other, net    4.4us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Net cash used in investing activities (24.2)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(29.4)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Cash Flows from Financing Activities:      
Proceeds from the issuance of senior notes   0us-gaap_ProceedsFromIssuanceOfUnsecuredDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Credit agreement borrowings 0us-gaap_ProceedsFromRepaymentsOfOtherDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Repurchase of senior notes, net of use of $250 million restricted cash in 2015 (see non-cash financing activities below) (Note 8) 0lea_EarlyRepaymentofSeniorDebtNetofRestrictedCashDisbursement
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0lea_EarlyRepaymentofSeniorDebtNetofRestrictedCashDisbursement
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Payment of debt issuance and other financing costs   0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Repurchase of common stock 0us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Dividends paid to Lear Corporation stockholders 0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Dividends paid to noncontrolling interests 0us-gaap_PaymentsOfDividendsMinorityInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_PaymentsOfDividendsMinorityInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Intercompany transactions 203.7lea_IntercompanyTransactionsProceedsFromPaymentsForFinancing
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
155.3lea_IntercompanyTransactionsProceedsFromPaymentsForFinancing
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Other, net 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Net cash provided by (used in) financing activities 203.7us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
155.3us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Effect of foreign currency translation 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Net Change in Cash and Cash Equivalents 0.1us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Cash and Cash Equivalents as of Beginning of Period 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Cash and Cash Equivalents as of End of Period 0.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cash restricted for use — acquisition of Eagle Ottawa 0lea_RestrictedCashDisbursementstoAcquireBusiness
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Cash restricted for use — repurchase of senior notes 0lea_RestrictedCashDisbursementsforRepaymentsofSeniorDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Non-guarantor subsidiaries      
Condensed Financial Statements, Captions [Line Items]      
Net Cash Used in Operating Activities 178.6us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
59.9us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Cash Flows from Investing Activities:      
Additions to property, plant and equipment (72.6)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(73.5)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Acquisition of Eagle Ottawa, net of cash acquired and use of $350 million restricted cash (see non-cash investing activities below) (Note 2) 20.2lea_PaymentstoAcquireBusinessesNetofCashAcquiredandRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Intercompany transactions 26.1lea_IntercompanyTransactionsProceedsFromPaymentsForInvesting
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(78.3)lea_IntercompanyTransactionsProceedsFromPaymentsForInvesting
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Other, net 10.2us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(18.6)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Net cash used in investing activities (16.1)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(170.4)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Cash Flows from Financing Activities:      
Proceeds from the issuance of senior notes   0us-gaap_ProceedsFromIssuanceOfUnsecuredDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Credit agreement borrowings 0us-gaap_ProceedsFromRepaymentsOfOtherDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Repurchase of senior notes, net of use of $250 million restricted cash in 2015 (see non-cash financing activities below) (Note 8) 0lea_EarlyRepaymentofSeniorDebtNetofRestrictedCashDisbursement
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0lea_EarlyRepaymentofSeniorDebtNetofRestrictedCashDisbursement
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Payment of debt issuance and other financing costs   0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Repurchase of common stock 0us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Dividends paid to Lear Corporation stockholders 0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Dividends paid to noncontrolling interests (0.1)us-gaap_PaymentsOfDividendsMinorityInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(5.8)us-gaap_PaymentsOfDividendsMinorityInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Intercompany transactions (302.8)lea_IntercompanyTransactionsProceedsFromPaymentsForFinancing
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
26.4lea_IntercompanyTransactionsProceedsFromPaymentsForFinancing
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Other, net 2.0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(2.2)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Net cash provided by (used in) financing activities (300.9)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
18.4us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Effect of foreign currency translation (29.6)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(3.4)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Net Change in Cash and Cash Equivalents (168.0)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(95.5)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Cash and Cash Equivalents as of Beginning of Period 716.3us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
794.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
 
Cash and Cash Equivalents as of End of Period 548.3us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
698.6us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
548.3us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cash restricted for use — acquisition of Eagle Ottawa 0lea_RestrictedCashDisbursementstoAcquireBusiness
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Cash restricted for use — repurchase of senior notes 0lea_RestrictedCashDisbursementsforRepaymentsofSeniorDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Consolidation, eliminations      
Condensed Financial Statements, Captions [Line Items]      
Net Cash Used in Operating Activities (75.0)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(5.2)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Cash Flows from Investing Activities:      
Additions to property, plant and equipment 0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Acquisition of Eagle Ottawa, net of cash acquired and use of $350 million restricted cash (see non-cash investing activities below) (Note 2) 0lea_PaymentstoAcquireBusinessesNetofCashAcquiredandRestrictedCash
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Intercompany transactions 17.6lea_IntercompanyTransactionsProceedsFromPaymentsForInvesting
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
269.8lea_IntercompanyTransactionsProceedsFromPaymentsForInvesting
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Other, net 0us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_PaymentsForProceedsFromOtherInvestingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Net cash used in investing activities 17.6us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
269.8us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Cash Flows from Financing Activities:      
Proceeds from the issuance of senior notes   0us-gaap_ProceedsFromIssuanceOfUnsecuredDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Credit agreement borrowings 0us-gaap_ProceedsFromRepaymentsOfOtherDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Repurchase of senior notes, net of use of $250 million restricted cash in 2015 (see non-cash financing activities below) (Note 8) 0lea_EarlyRepaymentofSeniorDebtNetofRestrictedCashDisbursement
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0lea_EarlyRepaymentofSeniorDebtNetofRestrictedCashDisbursement
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Payment of debt issuance and other financing costs   0us-gaap_PaymentsOfDebtIssuanceCosts
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Repurchase of common stock 0us-gaap_PaymentsForRepurchaseOfCommonStock
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Dividends paid to Lear Corporation stockholders 0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_PaymentsOfDividendsCommonStock
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Dividends paid to noncontrolling interests 0us-gaap_PaymentsOfDividendsMinorityInterest
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_PaymentsOfDividendsMinorityInterest
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Intercompany transactions 57.4lea_IntercompanyTransactionsProceedsFromPaymentsForFinancing
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(264.6)lea_IntercompanyTransactionsProceedsFromPaymentsForFinancing
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Other, net 0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Net cash provided by (used in) financing activities 57.4us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(264.6)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Effect of foreign currency translation 0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Net Change in Cash and Cash Equivalents 0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Cash and Cash Equivalents as of Beginning of Period 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
 
Cash and Cash Equivalents as of End of Period 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Cash restricted for use — acquisition of Eagle Ottawa 0lea_RestrictedCashDisbursementstoAcquireBusiness
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Cash restricted for use — repurchase of senior notes $ 0lea_RestrictedCashDisbursementsforRepaymentsofSeniorDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
[1] Unaudited.