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