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Supplemental Guarantor Consolidating Financial Statements - Supplemental Guarantor Consolidating Balance Sheets (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current Assets:        
Cash and cash equivalents $ 1,094.1us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,137.7us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,402.2us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,754.3us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable 2,471.7us-gaap_AccountsReceivableNetCurrent 2,278.3us-gaap_AccountsReceivableNetCurrent    
Inventories 853.7us-gaap_InventoryNet 818.7us-gaap_InventoryNet    
Intercompany accounts 0lea_IntercompanyAssets 0lea_IntercompanyAssets    
Other 960.1us-gaap_OtherAssetsCurrent 687.8us-gaap_OtherAssetsCurrent    
Total current assets 5,379.6us-gaap_AssetsCurrent 4,922.5us-gaap_AssetsCurrent    
Long-Term Assets:        
Property, plant and equipment, net 1,624.7us-gaap_PropertyPlantAndEquipmentNet 1,587.2us-gaap_PropertyPlantAndEquipmentNet    
Goodwill 726.2us-gaap_Goodwill 757.2us-gaap_Goodwill    
Investments in subsidiaries 0lea_InvestmentsInSubsidiaries 0lea_InvestmentsInSubsidiaries    
Intercompany Loans Receivable 0lea_IntercompanyLoansReceivable 0lea_IntercompanyLoansReceivable    
Other 1,419.7us-gaap_OtherAssetsNoncurrent 1,064.0us-gaap_OtherAssetsNoncurrent    
Total long-term assets 3,770.6us-gaap_AssetsNoncurrent 3,408.4us-gaap_AssetsNoncurrent    
Total assets 9,150.2us-gaap_Assets 8,330.9us-gaap_Assets 8,194.1us-gaap_Assets  
Current Liabilities:        
Accounts payable and drafts 2,525.3us-gaap_AccountsPayableCurrent 2,438.7us-gaap_AccountsPayableCurrent    
Accrued liabilities 1,188.8us-gaap_OtherLiabilitiesCurrent 1,140.4us-gaap_OtherLiabilitiesCurrent    
Intercompany Liabilities 0lea_IntercompanyLiabilities 0lea_IntercompanyLiabilities    
Current portion of long-term debt 243.7us-gaap_LongTermDebtCurrent 0us-gaap_LongTermDebtCurrent    
Total current liabilities 3,957.8us-gaap_LiabilitiesCurrent 3,579.1us-gaap_LiabilitiesCurrent    
Long-Term Liabilities:        
Long-term debt 1,475.0us-gaap_UnsecuredLongTermDebt 1,057.1us-gaap_UnsecuredLongTermDebt    
Intercompany loans payable 0lea_Intercompany 0lea_Intercompany    
Other 688.1us-gaap_OtherLiabilitiesNoncurrent 545.2us-gaap_OtherLiabilitiesNoncurrent    
Total long-term liabilities 2,163.1us-gaap_LiabilitiesNoncurrent 1,602.3us-gaap_LiabilitiesNoncurrent    
Equity:        
Lear Corporation stockholders’ equity 2,958.8us-gaap_StockholdersEquity 3,045.9us-gaap_StockholdersEquity    
Noncontrolling interests 70.5us-gaap_MinorityInterest 103.6us-gaap_MinorityInterest    
Equity 3,029.3us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 3,149.5us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 3,612.2us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 2,561.1us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and equity 9,150.2us-gaap_LiabilitiesAndStockholdersEquity 8,330.9us-gaap_LiabilitiesAndStockholdersEquity    
Lear        
Current Assets:        
Cash and cash equivalents 377.8us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
343.5us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
481.4us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
820.3us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Accounts receivable 53.9us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
41.2us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Inventories 1.8us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4.8us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Intercompany accounts 49.6lea_IntercompanyAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
66.0lea_IntercompanyAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other 416.9us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
147.7us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total current assets 900.0us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
603.2us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Long-Term Assets:        
Property, plant and equipment, net 106.4us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
95.5us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Goodwill 23.5us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
23.5us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Investments in subsidiaries 2,010.6lea_InvestmentsInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,791.4lea_InvestmentsInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Intercompany Loans Receivable 1,268.1lea_IntercompanyLoansReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,441.1lea_IntercompanyLoansReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other 928.8us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
591.5us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total long-term assets 4,337.4us-gaap_AssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3,943.0us-gaap_AssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total assets 5,237.4us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,546.2us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Current Liabilities:        
Accounts payable and drafts 91.1us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
73.8us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Accrued liabilities 138.1us-gaap_OtherLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
127.9us-gaap_OtherLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Intercompany Liabilities 0lea_IntercompanyLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0lea_IntercompanyLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Current portion of long-term debt 243.7us-gaap_LongTermDebtCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
     
Total current liabilities 472.9us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
201.7us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Long-Term Liabilities:        
Long-term debt 1,475.0us-gaap_UnsecuredLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,057.1us-gaap_UnsecuredLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Intercompany loans payable 138.9lea_Intercompany
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
123.0lea_Intercompany
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other 191.8us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
118.5us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total long-term liabilities 1,805.7us-gaap_LiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,298.6us-gaap_LiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Equity:        
Lear Corporation stockholders’ equity 2,958.8us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3,045.9us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Noncontrolling interests 0us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
0us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Equity 2,958.8us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3,045.9us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total liabilities and equity 5,237.4us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,546.2us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Guarantors        
Current Assets:        
Cash and cash equivalents 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Accounts receivable 459.0us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
349.7us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Inventories 348.1us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
297.9us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Intercompany accounts 40.7lea_IntercompanyAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0lea_IntercompanyAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other 76.2us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
77.3us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total current assets 924.0us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
725.0us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Long-Term Assets:        
Property, plant and equipment, net 334.5us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
316.0us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Goodwill 401.0us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
401.0us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Investments in subsidiaries 1,815.7lea_InvestmentsInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,898.6lea_InvestmentsInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Intercompany Loans Receivable 168.6lea_IntercompanyLoansReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
129.7lea_IntercompanyLoansReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other 65.9us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
71.5us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total long-term assets 2,785.7us-gaap_AssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
2,816.8us-gaap_AssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total assets 3,709.7us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
3,541.8us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Current Liabilities:        
Accounts payable and drafts 687.7us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
582.4us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Accrued liabilities 203.9us-gaap_OtherLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
156.1us-gaap_OtherLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Intercompany Liabilities 0lea_IntercompanyLiabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1.6lea_IntercompanyLiabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Current portion of long-term debt 0us-gaap_LongTermDebtCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
     
Total current liabilities 891.6us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
740.1us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Long-Term Liabilities:        
Long-term debt 0us-gaap_UnsecuredLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_UnsecuredLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Intercompany loans payable 698.8lea_Intercompany
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
654.3lea_Intercompany
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Other 198.0us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
143.0us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total long-term liabilities 896.8us-gaap_LiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
797.3us-gaap_LiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Equity:        
Lear Corporation stockholders’ equity 1,921.3us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
2,004.4us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Noncontrolling interests 0us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
0us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Equity 1,921.3us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
2,004.4us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Total liabilities and equity 3,709.7us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
3,541.8us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
   
Non- guarantors        
Current Assets:        
Cash and cash equivalents 716.3us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
794.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
920.7us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
933.9us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
Accounts receivable 1,958.8us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,887.4us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Inventories 503.8us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
516.0us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Intercompany accounts 0lea_IntercompanyAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0lea_IntercompanyAssets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Other 467.0us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
462.8us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total current assets 3,645.9us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
3,660.3us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Long-Term Assets:        
Property, plant and equipment, net 1,183.8us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,175.7us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Goodwill 301.7us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
332.7us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Investments in subsidiaries 0lea_InvestmentsInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0lea_InvestmentsInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Intercompany Loans Receivable 212.6lea_IntercompanyLoansReceivable
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
166.3lea_IntercompanyLoansReceivable
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Other 475.2us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
454.1us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total long-term assets 2,173.3us-gaap_AssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
2,128.8us-gaap_AssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total assets 5,819.2us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
5,789.1us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Current Liabilities:        
Accounts payable and drafts 1,746.5us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,782.5us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Accrued liabilities 846.8us-gaap_OtherLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
856.4us-gaap_OtherLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Intercompany Liabilities 90.3lea_IntercompanyLiabilities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
64.4lea_IntercompanyLiabilities
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Current portion of long-term debt 0us-gaap_LongTermDebtCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
     
Total current liabilities 2,683.6us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
2,703.3us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Long-Term Liabilities:        
Long-term debt 0us-gaap_UnsecuredLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
0us-gaap_UnsecuredLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Intercompany loans payable 811.6lea_Intercompany
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
959.8lea_Intercompany
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Other 348.5us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
336.8us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total long-term liabilities 1,160.1us-gaap_LiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,296.6us-gaap_LiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Equity:        
Lear Corporation stockholders’ equity 1,905.0us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,685.6us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Noncontrolling interests 70.5us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
103.6us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Equity 1,975.5us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
1,789.2us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Total liabilities and equity 5,819.2us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
5,789.1us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_NonGuarantorSubsidiariesMember
   
Eliminations        
Current Assets:        
Cash and cash equivalents 0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
Accounts receivable 0us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_AccountsReceivableNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Inventories 0us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_InventoryNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Intercompany accounts (90.3)lea_IntercompanyAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(66.0)lea_IntercompanyAssets
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Other 0us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Total current assets (90.3)us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(66.0)us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Long-Term Assets:        
Property, plant and equipment, net 0us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Goodwill 0us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_Goodwill
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Investments in subsidiaries (3,826.3)lea_InvestmentsInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(3,690.0)lea_InvestmentsInSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Intercompany Loans Receivable (1,649.3)lea_IntercompanyLoansReceivable
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(1,737.1)lea_IntercompanyLoansReceivable
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Other (50.2)us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(53.1)us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Total long-term assets (5,525.8)us-gaap_AssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(5,480.2)us-gaap_AssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Total assets (5,616.1)us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(5,546.2)us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Current Liabilities:        
Accounts payable and drafts 0us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_AccountsPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Accrued liabilities 0us-gaap_OtherLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_OtherLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Intercompany Liabilities (90.3)lea_IntercompanyLiabilities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(66.0)lea_IntercompanyLiabilities
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Current portion of long-term debt 0us-gaap_LongTermDebtCurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
     
Total current liabilities (90.3)us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(66.0)us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Long-Term Liabilities:        
Long-term debt 0us-gaap_UnsecuredLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_UnsecuredLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Intercompany loans payable (1,649.3)lea_Intercompany
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(1,737.1)lea_Intercompany
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Other (50.2)us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(53.1)us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Total long-term liabilities (1,699.5)us-gaap_LiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(1,790.2)us-gaap_LiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Equity:        
Lear Corporation stockholders’ equity (3,826.3)us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(3,690.0)us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Noncontrolling interests 0us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
0us-gaap_MinorityInterest
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Equity (3,826.3)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
(3,690.0)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
   
Total liabilities and equity $ (5,616.1)us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember
$ (5,546.2)us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ConsolidationEliminationsMember