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v2.4.1.9

Supplemental Guarantor Consolidating Financial Statements - Supplemental Guarantor Consolidating Statements of Income (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Dec. 31, 2013 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 4,549.7 us-gaap_SalesRevenueGoodsNet | $ 4,232.7 us-gaap_SalesRevenueGoodsNet | $ 4,585.1 us-gaap_SalesRevenueGoodsNet | $ 4,359.8 us-gaap_SalesRevenueGoodsNet | $ 4,256.1 us-gaap_SalesRevenueGoodsNet | $ 3,917.7 us-gaap_SalesRevenueGoodsNet | $ 4,113.1 us-gaap_SalesRevenueGoodsNet | $ 3,947.1 us-gaap_SalesRevenueGoodsNet | $ 17,727.3 us-gaap_SalesRevenueGoodsNet | $ 16,234.0 us-gaap_SalesRevenueGoodsNet | $ 14,567.0 us-gaap_SalesRevenueGoodsNet
Cost of sales |  |  |  |  |  |  |  |  | 16,234.5 us-gaap_CostOfGoodsSold | 14,934.3 us-gaap_CostOfGoodsSold | 13,349.5 us-gaap_CostOfGoodsSold
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 529.9 us-gaap_SellingGeneralAndAdministrativeExpense | 528.7 us-gaap_SellingGeneralAndAdministrativeExpense | 479.3 us-gaap_SellingGeneralAndAdministrativeExpense
Intercompany operating (income) expense, net |  |  |  |  |  |  |  |  | 0 lea_IntercompanyIncomeExpense | 0 lea_IntercompanyIncomeExpense | 0 lea_IntercompanyIncomeExpense
Amortization of intangible assets |  |  |  |  |  |  |  |  | 33.7 us-gaap_AmortizationOfIntangibleAssets | 34.4 us-gaap_AmortizationOfIntangibleAssets | 33.0 us-gaap_AmortizationOfIntangibleAssets
Interest expense |  |  |  |  |  |  |  |  | 67.5 us-gaap_InterestExpense | 68.4 us-gaap_InterestExpense | 49.9 us-gaap_InterestExpense
Other expense, net |  |  |  |  |  |  |  |  | 74.3 lea_OtherIncomeExpenseNet | 58.1 lea_OtherIncomeExpenseNet | 6.4 lea_OtherIncomeExpenseNet
Consolidated income before provision (benefit) for income taxes and equity in net income of affiliates |  |  |  |  |  |  |  |  | 787.4 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 610.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 648.9 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | 121.4 us-gaap_IncomeTaxExpenseBenefit | 192.7 us-gaap_IncomeTaxExpenseBenefit | (638.0)us-gaap_IncomeTaxExpenseBenefit
Equity in net income of affiliates |  |  |  |  |  |  |  |  | (36.3)us-gaap_IncomeLossFromEquityMethodInvestments | (38.4)us-gaap_IncomeLossFromEquityMethodInvestments | (30.3)us-gaap_IncomeLossFromEquityMethodInvestments
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 0 lea_IncomeLossFromSubsidiaryInvestments | 0 lea_IncomeLossFromSubsidiaryInvestments | 0 lea_IncomeLossFromSubsidiaryInvestments
Consolidated net income | 268.0 us-gaap_ProfitLoss | 147.9 us-gaap_ProfitLoss | 157.8 us-gaap_ProfitLoss | 128.6 us-gaap_ProfitLoss | 79.9 us-gaap_ProfitLoss | 116.7 us-gaap_ProfitLoss | 142.3 us-gaap_ProfitLoss | 116.9 us-gaap_ProfitLoss | 702.3 us-gaap_ProfitLoss | 455.8 us-gaap_ProfitLoss | 1,317.2 us-gaap_ProfitLoss
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 29.9 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 24.4 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 34.4 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to Lear | 261.8 us-gaap_NetIncomeLoss | 140.1 us-gaap_NetIncomeLoss | 148.5 us-gaap_NetIncomeLoss | 122.0 us-gaap_NetIncomeLoss | 72.8 us-gaap_NetIncomeLoss | 112.8 us-gaap_NetIncomeLoss | 137.3 us-gaap_NetIncomeLoss | 108.5 us-gaap_NetIncomeLoss | 672.4 us-gaap_NetIncomeLoss | 431.4 us-gaap_NetIncomeLoss | 1,282.8 us-gaap_NetIncomeLoss
Consolidated comprehensive income |  |  |  |  |  |  |  |  | 364.5 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | 592.0 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | 1,349.6 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Less: Comprehensive income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 28.0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | 25.9 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | 35.6 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive income attributable to Lear |  |  |  |  |  |  |  |  | 336.5 us-gaap_ComprehensiveIncomeNetOfTax | 566.1 us-gaap_ComprehensiveIncomeNetOfTax | 1,314.0 us-gaap_ComprehensiveIncomeNetOfTax
Lear |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 467.1 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 449.0 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 483.7 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cost of sales |  |  |  |  |  |  |  |  | 662.7 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 643.6 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 576.7 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 227.3 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 211.4 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 230.8 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Intercompany operating (income) expense, net |  |  |  |  |  |  |  |  | (448.2)lea_IntercompanyIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (395.4)lea_IntercompanyIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (286.0)lea_IntercompanyIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Amortization of intangible assets |  |  |  |  |  |  |  |  | 1.7 us-gaap_AmortizationOfIntangibleAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1.7 us-gaap_AmortizationOfIntangibleAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1.7 us-gaap_AmortizationOfIntangibleAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest expense |  |  |  |  |  |  |  |  | 49.0 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 52.0 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2.3 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other expense, net |  |  |  |  |  |  |  |  | 26.5 lea_OtherIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6.5 lea_OtherIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2.9 lea_OtherIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Consolidated income before provision (benefit) for income taxes and equity in net income of affiliates |  |  |  |  |  |  |  |  | (51.9)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (70.8)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (44.7)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | (21.6)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (33.9)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (724.5)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in net income of affiliates |  |  |  |  |  |  |  |  | 0.4 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0.7 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (6.1)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (703.1)lea_IncomeLossFromSubsidiaryInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (469.0)lea_IncomeLossFromSubsidiaryInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (596.9)lea_IncomeLossFromSubsidiaryInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Consolidated net income |  |  |  |  |  |  |  |  | 672.4 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 431.4 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,282.8 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income attributable to Lear |  |  |  |  |  |  |  |  | 672.4 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 431.4 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,282.8 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Consolidated comprehensive income |  |  |  |  |  |  |  |  | 336.5 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 566.1 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,314.0 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Less: Comprehensive income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Comprehensive income attributable to Lear |  |  |  |  |  |  |  |  | 336.5 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 566.1 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,314.0 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Guarantors |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 7,086.4 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 6,261.1 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 5,850.1 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Cost of sales |  |  |  |  |  |  |  |  | 6,468.6 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 5,629.5 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 5,274.2 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 36.4 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 20.6 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 21.0 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Intercompany operating (income) expense, net |  |  |  |  |  |  |  |  | 287.2 lea_IntercompanyIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 292.4 lea_IntercompanyIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 156.4 lea_IntercompanyIncomeExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Amortization of intangible assets |  |  |  |  |  |  |  |  | 4.7 us-gaap_AmortizationOfIntangibleAssets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 4.7 us-gaap_AmortizationOfIntangibleAssets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 2.8 us-gaap_AmortizationOfIntangibleAssets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Interest expense |  |  |  |  |  |  |  |  | 24.9 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 19.3 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 21.8 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Other expense, net |  |  |  |  |  |  |  |  | 1.0 lea_OtherIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 7.6 lea_OtherIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 2.4 lea_OtherIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Consolidated income before provision (benefit) for income taxes and equity in net income of affiliates |  |  |  |  |  |  |  |  | 263.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 287.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 371.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | 93.3 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 113.6 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (0.5)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Equity in net income of affiliates |  |  |  |  |  |  |  |  | (1.5)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (2.0)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (3.6)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (390.3)lea_IncomeLossFromSubsidiaryInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (138.2)lea_IncomeLossFromSubsidiaryInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (197.1)lea_IncomeLossFromSubsidiaryInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Consolidated net income |  |  |  |  |  |  |  |  | 562.1 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 313.6 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 572.7 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Net income attributable to Lear |  |  |  |  |  |  |  |  | 562.1 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 313.6 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 572.7 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Consolidated comprehensive income |  |  |  |  |  |  |  |  | 502.1 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 340.8 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 622.3 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Less: Comprehensive income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Comprehensive income attributable to Lear |  |  |  |  |  |  |  |  | 502.1 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 340.8 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 622.3 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Non- guarantors |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 14,996.5 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 14,042.2 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 12,484.6 us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Cost of sales |  |  |  |  |  |  |  |  | 13,925.9 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 13,179.5 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 11,750.0 us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 266.2 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 296.7 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 227.5 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Intercompany operating (income) expense, net |  |  |  |  |  |  |  |  | 161.0 lea_IntercompanyIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 103.0 lea_IntercompanyIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 129.6 lea_IntercompanyIncomeExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Amortization of intangible assets |  |  |  |  |  |  |  |  | 27.3 us-gaap_AmortizationOfIntangibleAssets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 28.0 us-gaap_AmortizationOfIntangibleAssets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 28.5 us-gaap_AmortizationOfIntangibleAssets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Interest expense |  |  |  |  |  |  |  |  | (6.4)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (2.9)us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 25.8 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Other expense, net |  |  |  |  |  |  |  |  | 46.8 lea_OtherIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 44.0 lea_OtherIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 1.1 lea_OtherIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Consolidated income before provision (benefit) for income taxes and equity in net income of affiliates |  |  |  |  |  |  |  |  | 575.7 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 393.9 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 322.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Provision (benefit) for income taxes |  |  |  |  |  |  |  |  | 49.7 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 113.0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 87.0 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Equity in net income of affiliates |  |  |  |  |  |  |  |  | (35.2)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (37.1)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (20.6)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 0 lea_IncomeLossFromSubsidiaryInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 lea_IncomeLossFromSubsidiaryInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 lea_IncomeLossFromSubsidiaryInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Consolidated net income |  |  |  |  |  |  |  |  | 561.2 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 318.0 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 255.7 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 29.9 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 24.4 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 34.4 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Net income attributable to Lear |  |  |  |  |  |  |  |  | 531.3 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 293.6 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 221.3 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Consolidated comprehensive income |  |  |  |  |  |  |  |  | 320.4 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 379.0 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 259.1 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Less: Comprehensive income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 28.0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 25.9 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 35.6 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Comprehensive income attributable to Lear |  |  |  |  |  |  |  |  | 292.4 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 353.1 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 223.5 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Eliminations |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (4,822.7)us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (4,518.3)us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (4,251.4)us-gaap_SalesRevenueGoodsNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Cost of sales |  |  |  |  |  |  |  |  | (4,822.7)us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (4,518.3)us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (4,251.4)us-gaap_CostOfGoodsSold / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
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Interest expense |  |  |  |  |  |  |  |  | 0 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Other expense, net |  |  |  |  |  |  |  |  | 0 lea_OtherIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 lea_OtherIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 lea_OtherIncomeExpenseNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
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Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 1,093.4 lea_IncomeLossFromSubsidiaryInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 607.2 lea_IncomeLossFromSubsidiaryInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 794.0 lea_IncomeLossFromSubsidiaryInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Consolidated net income |  |  |  |  |  |  |  |  | (1,093.4)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (607.2)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (794.0)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Less: Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Net income attributable to Lear |  |  |  |  |  |  |  |  | (1,093.4)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (607.2)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (794.0)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Consolidated comprehensive income |  |  |  |  |  |  |  |  | (794.5)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (693.9)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (845.8)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Less: Comprehensive income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Comprehensive income attributable to Lear |  |  |  |  |  |  |  |  | $ (794.5)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ (693.9)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ (845.8)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember

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