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Segment Reporting - Revenue from External Customers and Tangible Long-lived Assets for each of Geographic Area (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
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 4,549.7us-gaap_SalesRevenueGoodsNet	$ 4,232.7us-gaap_SalesRevenueGoodsNet	$ 4,585.1us-gaap_SalesRevenueGoodsNet	$ 4,359.8us-gaap_SalesRevenueGoodsNet	$ 4,256.1us-gaap_SalesRevenueGoodsNet	$ 3,917.7us-gaap_SalesRevenueGoodsNet	$ 4,113.1us-gaap_SalesRevenueGoodsNet	$ 3,947.1us-gaap_SalesRevenueGoodsNet	$ 17,727.3us-gaap_SalesRevenueGoodsNet	$ 16,234.0us-gaap_SalesRevenueGoodsNet	$ 14,567.0us-gaap_SalesRevenueGoodsNet
Property, plant and equipment, net	1,624.7us-gaap_PropertyPlantAndEquipmentNet				1,587.2us-gaap_PropertyPlantAndEquipmentNet				1,624.7us-gaap_PropertyPlantAndEquipmentNet	1,587.2us-gaap_PropertyPlantAndEquipmentNet
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									3,708.4us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_US	3,046.0us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_US	2,891.4us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_US
Property, plant and equipment, net	274.1us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US				246.1us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US				274.1us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US	246.1us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									2,373.9us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_MX	2,225.9us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_MX	1,991.8us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_MX
Property, plant and equipment, net	293.3us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_MX				271.8us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_MX				293.3us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_MX	271.8us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_MX
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									2,327.7us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_DE	2,204.6us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_DE	2,142.4us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_DE
Property, plant and equipment, net	140.6us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_DE				150.8us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_DE				140.6us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_DE	150.8us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_DE
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									2,092.9us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_CN	1,842.9us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_CN	1,467.6us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_CN
Property, plant and equipment, net	179.8us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN				170.6us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN				179.8us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN	170.6us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_CN
Other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									7,224.4us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = lea_OtherCountriesMember	6,914.6us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = lea_OtherCountriesMember	6,073.8us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = lea_OtherCountriesMember
Property, plant and equipment, net	$ 736.9us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = lea_OtherCountriesMember				$ 747.9us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = lea_OtherCountriesMember				$ 736.9us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = lea_OtherCountriesMember	$ 747.9us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = lea_OtherCountriesMember

X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-SubTopic 10

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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X

- 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

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-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a))

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