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Restructuring - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 107.0 us-gaap_RestructuringCharges | $ 77.9 us-gaap_RestructuringCharges | $ 55.1 us-gaap_RestructuringCharges
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
Other expense, net | (74.3)lea_OtherIncomeExpenseNet | (58.1)lea_OtherIncomeExpenseNet | (6.4)lea_OtherIncomeExpenseNet
Restructuring, expected cost | 30.4 us-gaap_RestructuringAndRelatedCostExpectedCost1 |  |
Restructuring charges excluding pension opeb charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 107.0 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember | 75.4 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember | 55.1 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember
Restructuring charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Cost of sales | 86.8 us-gaap_CostOfGoodsSold / us-gaap_RestructuringCostAndReserveAxis = us-gaap_RestructuringChargesMember | 52.6 us-gaap_CostOfGoodsSold / us-gaap_RestructuringCostAndReserveAxis = us-gaap_RestructuringChargesMember | 44.8 us-gaap_CostOfGoodsSold / us-gaap_RestructuringCostAndReserveAxis = us-gaap_RestructuringChargesMember
Selling, general and administrative expenses | 19.2 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_RestructuringCostAndReserveAxis = us-gaap_RestructuringChargesMember | 25.3 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_RestructuringCostAndReserveAxis = us-gaap_RestructuringChargesMember | 10.4 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_RestructuringCostAndReserveAxis = us-gaap_RestructuringChargesMember
Other expense, net | 1.0 lea_OtherIncomeExpenseNet / us-gaap_RestructuringCostAndReserveAxis = us-gaap_RestructuringChargesMember |  | (0.1)lea_OtherIncomeExpenseNet / us-gaap_RestructuringCostAndReserveAxis = us-gaap_RestructuringChargesMember
Employee termination benefits |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 88.6 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 54.1 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 45.4 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Asset impairments |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 0.5 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = lea_AssetImpairmentChargeMember | 9.2 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = lea_AssetImpairmentChargeMember | 6.0 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = lea_AssetImpairmentChargeMember
Contract termination costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 0.5 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember | 2.8 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember | 1.9 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember
Pension benefit plan settlement charge |  | 2.5 us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember |
Contract termination costs | Restructuring charges excluding pension opeb charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 0.5 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember | 0.3 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember | 1.9 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember
Other related costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 17.4 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | $ 11.8 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | $ 1.8 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember

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- Definition Total costs related to goods produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount expected to be recognized in earnings for the specified restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34747878&loc=d3e3636-108311 + Details
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