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v2.4.1.9

Restructuring - Summary of Restructuring Activities (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 28, 2015
Restructuring Reserve [Roll Forward] |
Accrual as of beginning of period | $ 50.2 us-gaap_RestructuringReserve
Restructuring charges | 7.3 us-gaap_RestructuringCharges
Utilization cash | (11.0)us-gaap_PaymentsForRestructuring
Utilization non-cash | (1.1)us-gaap_RestructuringReserveSettledWithoutCash1
Accrual as of end of period | 45.4 us-gaap_RestructuringReserve
Employee termination benefits |
Restructuring Reserve [Roll Forward] |
Accrual as of beginning of period | 45.1 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Restructuring charges | 4.5 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Utilization cash | (9.5)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Utilization non-cash | 0 us-gaap_RestructuringReserveSettledWithoutCash1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Accrual as of end of period | 40.1 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Asset impairment charges |
Restructuring Reserve [Roll Forward] |
Accrual as of beginning of period | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = lea_AssetImpairmentChargeMember
Restructuring charges | 1.1 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = lea_AssetImpairmentChargeMember
Utilization cash | 0 us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = lea_AssetImpairmentChargeMember
Utilization non-cash | (1.1)us-gaap_RestructuringReserveSettledWithoutCash1 / us-gaap_RestructuringCostAndReserveAxis = lea_AssetImpairmentChargeMember
Accrual as of end of period | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = lea_AssetImpairmentChargeMember
Contract termination costs |
Restructuring Reserve [Roll Forward] |
Accrual as of beginning of period | 5.1 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember
Restructuring charges | 1.0 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember
Utilization cash | (0.8)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember
Utilization non-cash | 0 us-gaap_RestructuringReserveSettledWithoutCash1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember
Accrual as of end of period | 5.3 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember
Other related costs |
Restructuring Reserve [Roll Forward] |
Accrual as of beginning of period | 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember
Restructuring charges | 0.7 us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember
Utilization cash | (0.7)us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember
Utilization non-cash | 0 us-gaap_RestructuringReserveSettledWithoutCash1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember
Accrual as of end of period | $ 0 us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember

X
- 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=56944662&loc=d3e3602-108585 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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=56944662&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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
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Balance Type: | credit
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- 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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Period Type: | duration

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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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