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Supplemental Guarantor Condensed Consolidating Financial Statements - Income Statement (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Condensed Financial Statements, Captions [Line Items]    
Net sales $ 4,521.4us-gaap_SalesRevenueGoodsNet $ 4,359.8us-gaap_SalesRevenueGoodsNet
Cost of sales 4,095.7us-gaap_CostOfGoodsSold 3,999.3us-gaap_CostOfGoodsSold
Selling, general and administrative expenses 151.7us-gaap_SellingGeneralAndAdministrativeExpense 136.7us-gaap_SellingGeneralAndAdministrativeExpense
Intercompany operating (income) expense, net 0lea_IntercompanyIncomeExpense 0lea_IntercompanyIncomeExpense
Amortization of intangible assets 13.3us-gaap_AmortizationOfIntangibleAssets 8.5us-gaap_AmortizationOfIntangibleAssets
Interest expense 24.4us-gaap_InterestExpense 16.8us-gaap_InterestExpense
Other expense, net 30.0lea_OtherIncomeExpenseNet 29.2lea_OtherIncomeExpenseNet
Consolidated income before provision for income taxes and equity in net income of affiliates 206.3us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 169.3us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Provision for income taxes 62.9us-gaap_IncomeTaxExpenseBenefit 52.7us-gaap_IncomeTaxExpenseBenefit
Equity in net income of affiliates (13.3)us-gaap_IncomeLossFromEquityMethodInvestments (12.0)us-gaap_IncomeLossFromEquityMethodInvestments
Equity in net income of subsidiaries 0lea_IncomeLossFromSubsidiaryInvestments 0lea_IncomeLossFromSubsidiaryInvestments
Consolidated net income 156.7us-gaap_ProfitLoss 128.6us-gaap_ProfitLoss
Less: Net income attributable to noncontrolling interests 9.4us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 6.6us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to Lear 147.3us-gaap_NetIncomeLoss 122.0us-gaap_NetIncomeLoss
Consolidated comprehensive income 28.8us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 117.8us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Less: Comprehensive income attributable to noncontrolling interests 9.3us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest 4.8us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive income attributable to Lear 19.5us-gaap_ComprehensiveIncomeNetOfTax 113.0us-gaap_ComprehensiveIncomeNetOfTax
Parent company    
Condensed Financial Statements, Captions [Line Items]    
Net sales 96.8us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
103.1us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cost of sales 148.3us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
153.3us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Selling, general and administrative expenses 61.2us-gaap_SellingGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
62.6us-gaap_SellingGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Intercompany operating (income) expense, net (147.9)lea_IntercompanyIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(129.2)lea_IntercompanyIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Amortization of intangible assets 0.4us-gaap_AmortizationOfIntangibleAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0.4us-gaap_AmortizationOfIntangibleAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Interest expense 20.8us-gaap_InterestExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
13.5us-gaap_InterestExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other expense, net 14.2lea_OtherIncomeExpenseNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
17.3lea_OtherIncomeExpenseNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Consolidated income before provision for income taxes and equity in net income of affiliates (0.2)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(14.8)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Provision for income taxes 2.8us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(6.6)us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Equity in net income of affiliates (0.3)us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0.1us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Equity in net income of subsidiaries (150.0)lea_IncomeLossFromSubsidiaryInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(130.3)lea_IncomeLossFromSubsidiaryInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Consolidated net income 147.3us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
122.0us-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
Net income attributable to Lear 147.3us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
122.0us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Consolidated comprehensive income 19.5us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
113.0us-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
Comprehensive income attributable to Lear 19.5us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
113.0us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Guarantor subsidiaries    
Condensed Financial Statements, Captions [Line Items]    
Net sales 1,828.9us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,634.6us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Cost of sales 1,664.6us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,484.0us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Selling, general and administrative expenses 10.5us-gaap_SellingGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
5.3us-gaap_SellingGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Intercompany operating (income) expense, net 70.4lea_IntercompanyIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
69.7lea_IntercompanyIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Amortization of intangible assets 1.2us-gaap_AmortizationOfIntangibleAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1.2us-gaap_AmortizationOfIntangibleAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Interest expense 6.2us-gaap_InterestExpense
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
4.8us-gaap_InterestExpense
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Other expense, net (2.1)lea_OtherIncomeExpenseNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(0.3)lea_OtherIncomeExpenseNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Consolidated income before provision for income taxes and equity in net income of affiliates 78.1us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
69.9us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Provision for income taxes 32.9us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
30.2us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Equity in net income of affiliates (0.7)us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(0.5)us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Equity in net income of subsidiaries (65.4)lea_IncomeLossFromSubsidiaryInvestments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(52.0)lea_IncomeLossFromSubsidiaryInvestments
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Consolidated net income 111.3us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
92.2us-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
Net income attributable to Lear 111.3us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
92.2us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Consolidated comprehensive income 94.6us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
93.3us-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
Comprehensive income attributable to Lear 94.6us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
93.3us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Non-guarantor subsidiaries    
Condensed Financial Statements, Captions [Line Items]    
Net sales 3,886.6us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
3,791.1us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Cost of sales 3,573.7us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
3,531.0us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Selling, general and administrative expenses 80.0us-gaap_SellingGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
68.8us-gaap_SellingGeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Intercompany operating (income) expense, net 77.5lea_IntercompanyIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
59.5lea_IntercompanyIncomeExpense
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Amortization of intangible assets 11.7us-gaap_AmortizationOfIntangibleAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
6.9us-gaap_AmortizationOfIntangibleAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Interest expense (2.6)us-gaap_InterestExpense
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(1.5)us-gaap_InterestExpense
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Other expense, net 17.9lea_OtherIncomeExpenseNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
12.2lea_OtherIncomeExpenseNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Consolidated income before provision for income taxes and equity in net income of affiliates 128.4us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
114.2us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Provision for income taxes 27.2us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
29.1us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Equity in net income of affiliates (12.3)us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
(11.6)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
Consolidated net income 113.5us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
96.7us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Less: Net income attributable to noncontrolling interests 9.4us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
6.6us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Net income attributable to Lear 104.1us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
90.1us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Consolidated comprehensive income (8.7)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
84.4us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Less: Comprehensive income attributable to noncontrolling interests 9.3us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
4.8us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Comprehensive income attributable to Lear (18.0)us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
79.6us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Consolidation, eliminations    
Condensed Financial Statements, Captions [Line Items]    
Net sales (1,290.9)us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(1,169.0)us-gaap_SalesRevenueGoodsNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Cost of sales (1,290.9)us-gaap_CostOfGoodsSold
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(1,169.0)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
= 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
Interest expense 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
Consolidated income before provision for income taxes and equity in net income of affiliates 0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Provision for income taxes 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
= us-gaap_ConsolidationEliminationsMember
0us-gaap_IncomeLossFromEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Equity in net income of subsidiaries 215.4lea_IncomeLossFromSubsidiaryInvestments
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
182.3lea_IncomeLossFromSubsidiaryInvestments
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Consolidated net income (215.4)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(182.3)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
Net income attributable to Lear (215.4)us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(182.3)us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Consolidated comprehensive income (76.6)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(172.9)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
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Comprehensive income attributable to Lear $ (76.6)us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
$ (172.9)us-gaap_ComprehensiveIncomeNetOfTax
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember