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Segment Reporting - Summary of Segment Financial Information (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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers | $ 4,549.7 us-gaap_SalesRevenueGoodsNet | $ 4,232.7 us-gaap_SalesRevenueGoodsNet | $ 4,585.1 us-gaap_SalesRevenueGoodsNet | $ 4,359.8 us-gaap_SalesRevenueGoodsNet | $ 4,256.1 us-gaap_SalesRevenueGoodsNet | $ 3,917.7 us-gaap_SalesRevenueGoodsNet | $ 4,113.1 us-gaap_SalesRevenueGoodsNet | $ 3,947.1 us-gaap_SalesRevenueGoodsNet | $ 17,727.3 us-gaap_SalesRevenueGoodsNet |  | $ 16,234.0 us-gaap_SalesRevenueGoodsNet |  | $ 14,567.0 us-gaap_SalesRevenueGoodsNet |
Segment earnings |  |  |  |  |  |  |  |  | 929.2 lea_SegmentEarningsLosses | [1] | 736.6 lea_SegmentEarningsLosses | [1] | 705.2 lea_SegmentEarningsLosses | [1]
Depreciation and amortization |  |  |  |  |  |  |  |  | 310.9 us-gaap_DepreciationDepletionAndAmortization |  | 285.5 us-gaap_DepreciationDepletionAndAmortization |  | 239.5 us-gaap_DepreciationDepletionAndAmortization |
Capital expenditures |  |  |  |  |  |  |  |  | 424.7 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  | 460.6 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  | 458.3 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |
Total assets | 9,150.2 us-gaap_Assets |  |  |  | 8,330.9 us-gaap_Assets |  |  |  | 9,150.2 us-gaap_Assets |  | 8,330.9 us-gaap_Assets |  | 8,194.1 us-gaap_Assets |
Operating segments | Seating |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 13,310.6 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember |  | 12,018.1 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember |  | 11,029.6 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember |
Segment earnings |  |  |  |  |  |  |  |  | 655.2 lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember | [1] | 576.9 lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember | [1] | 661.7 lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember | [1]
Depreciation and amortization |  |  |  |  |  |  |  |  | 199.8 us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember |  | 181.3 us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember |  | 152.6 us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember |
Capital expenditures |  |  |  |  |  |  |  |  | 268.9 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember |  | 288.5 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember |  | 290.7 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember |
Total assets | 4,855.6 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember |  |  |  | 4,640.0 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember |  |  |  | 4,855.6 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember |  | 4,640.0 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember |  | 4,341.9 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_SeatingMember |
Operating segments | Electrical |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 4,416.7 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember |  | 4,215.9 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember |  | 3,537.4 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember |
Segment earnings |  |  |  |  |  |  |  |  | 556.6 lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember | [1] | 414.3 lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember | [1] | 254.9 lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember | [1]
Depreciation and amortization |  |  |  |  |  |  |  |  | 103.3 us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember |  | 96.4 us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember |  | 78.4 us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember |
Capital expenditures |  |  |  |  |  |  |  |  | 138.4 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember |  | 163.4 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember |  | 158.1 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember |
Total assets | 1,609.9 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember |  |  |  | 1,658.3 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember |  |  |  | 1,609.9 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember |  | 1,658.3 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember |  | 1,432.2 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = lea_ElectricalMember |
Corporate and regional headquarters and elimination of intercompany activity ("Other") |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 0 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember |  | 0 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember |  | 0 us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember |
Segment earnings |  |  |  |  |  |  |  |  |  |  | (254.6)lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember | [1] | (211.4)lea_SegmentEarningsLosses / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember | [1]
Depreciation and amortization |  |  |  |  |  |  |  |  | 7.8 us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember |  | 7.8 us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember |  | 8.5 us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember |
Capital expenditures |  |  |  |  |  |  |  |  | 17.4 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember |  | 8.7 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember |  | 9.5 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember |
Total assets | $ 2,684.7 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember |  |  |  | $ 2,032.6 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember |  |  |  | $ 2,684.7 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember |  | $ 2,032.6 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember |  | $ 2,420.0 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = lea_AllOtherMember |
[1] | (1)See definition in Note 2, "Summary of Significant Accounting Policies — Segment Reporting."

X
- Definition Amount of pretax income or loss for the reportable segment before interest, other (income) expense, provision (benefit) for income taxes and equity in net (income) loss of affiliates. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

X
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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X
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + 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 210.5-03.1(a)) -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 1 -Article 5 + Details
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