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Restructuring - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 107.0us-gaap_RestructuringCharges $ 77.9us-gaap_RestructuringCharges $ 55.1us-gaap_RestructuringCharges
Cost of sales 16,234.5us-gaap_CostOfGoodsSold 14,934.3us-gaap_CostOfGoodsSold 13,349.5us-gaap_CostOfGoodsSold
Selling, general and administrative expenses 529.9us-gaap_SellingGeneralAndAdministrativeExpense 528.7us-gaap_SellingGeneralAndAdministrativeExpense 479.3us-gaap_SellingGeneralAndAdministrativeExpense
Other expense, net (74.3)lea_OtherIncomeExpenseNet (58.1)lea_OtherIncomeExpenseNet (6.4)lea_OtherIncomeExpenseNet
Restructuring, expected cost 30.4us-gaap_RestructuringAndRelatedCostExpectedCost1    
Restructuring charges excluding pension opeb charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 107.0us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= lea_RestructuringChargesExcludingPensionOpebChargesMember
75.4us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= lea_RestructuringChargesExcludingPensionOpebChargesMember
55.1us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= lea_RestructuringChargesExcludingPensionOpebChargesMember
Restructuring charges      
Restructuring Cost and Reserve [Line Items]      
Cost of sales 86.8us-gaap_CostOfGoodsSold
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RestructuringChargesMember
52.6us-gaap_CostOfGoodsSold
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RestructuringChargesMember
44.8us-gaap_CostOfGoodsSold
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RestructuringChargesMember
Selling, general and administrative expenses 19.2us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RestructuringChargesMember
25.3us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RestructuringChargesMember
10.4us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RestructuringChargesMember
Other expense, net 1.0lea_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 88.6us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
54.1us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
45.4us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Asset impairments      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 0.5us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= lea_AssetImpairmentChargeMember
9.2us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= lea_AssetImpairmentChargeMember
6.0us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= lea_AssetImpairmentChargeMember
Contract termination costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 0.5us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_ContractTerminationMember
2.8us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_ContractTerminationMember
1.9us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_ContractTerminationMember
Pension benefit plan settlement charge   2.5us-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 0.5us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_ContractTerminationMember
/ us-gaap_RestructuringPlanAxis
= lea_RestructuringChargesExcludingPensionOpebChargesMember
0.3us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_ContractTerminationMember
/ us-gaap_RestructuringPlanAxis
= lea_RestructuringChargesExcludingPensionOpebChargesMember
1.9us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_ContractTerminationMember
/ us-gaap_RestructuringPlanAxis
= lea_RestructuringChargesExcludingPensionOpebChargesMember
Other related costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 17.4us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
$ 11.8us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember
$ 1.8us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_OtherRestructuringMember