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v2.4.1.9

Restructuring - Summary of Restructuring Activities (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] |  |  |
Current year charges | $ 107.0 us-gaap_RestructuringCharges | $ 77.9 us-gaap_RestructuringCharges | $ 55.1 us-gaap_RestructuringCharges
Restructuring charges excluding pension opeb charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Accrual as of beginning of period | 44.3 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember | 44.2 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember | 62.5 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember
Current year 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
Utilization cash | (100.6)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember | (66.1)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember | (67.4)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember
Utilization non-cash | (0.5)us-gaap_RestructuringReserveSettledWithoutCash1 / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember | (9.2)us-gaap_RestructuringReserveSettledWithoutCash1 / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember | (6.0)us-gaap_RestructuringReserveSettledWithoutCash1 / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember
Accrual as of end of period | 50.2 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember | 44.3 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember | 44.2 us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember
Employee termination benefits |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Accrual as of beginning of period | 38.7 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 38.5 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 56.8 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Current year 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
Utilization cash |  | (53.9)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | (63.7)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Accrual as of end of period |  | 38.7 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 38.5 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Employee termination benefits | Restructuring charges excluding pension opeb charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Accrual as of beginning of period | 38.7 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember |  |
Utilization cash | (82.2)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember |  |
Accrual as of end of period | 45.1 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember |  |
Asset impairments |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Current year 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
Utilization non-cash | (0.5)us-gaap_RestructuringReserveSettledWithoutCash1 / us-gaap_RestructuringCostAndReserveAxis = lea_AssetImpairmentChargeMember | (9.2)us-gaap_RestructuringReserveSettledWithoutCash1 / us-gaap_RestructuringCostAndReserveAxis = lea_AssetImpairmentChargeMember | (6.0)us-gaap_RestructuringReserveSettledWithoutCash1 / us-gaap_RestructuringCostAndReserveAxis = lea_AssetImpairmentChargeMember
Contract termination costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Current year 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
Contract termination costs | Restructuring charges excluding pension opeb charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Accrual as of beginning of period | 5.6 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember | 5.7 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember | 5.7 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember
Current year 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
Utilization cash | (1.0)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember | (0.4)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember | (1.9)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember
Accrual as of end of period | 5.1 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember | 5.6 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember | 5.7 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember / us-gaap_RestructuringPlanAxis = lea_RestructuringChargesExcludingPensionOpebChargesMember
Other related costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Current year 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
Utilization cash | $ (17.4)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | $ (11.8)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | $ (1.8)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with 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 + 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 Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: 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 2: 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 Amount of consideration other than cash used to fully or partially settle an accrued 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)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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