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Segment Reporting - Reconciliation of Segment Earnings to Income Before Provision for Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Segment Reporting [Abstract]
Segment earnings	$ 302.6	$ 224.5	$ 848.8	$ 672.6
Interest expense	21.4	15.7	66.3	47.1
Other expense, net	21.7	11.1	60.4	57.1
Consolidated income before provision for income taxes and equity in net income of affiliates	$ 259.5	$ 197.7	$ 722.1	$ 568.4

X

- Definition

The sum of all other income and expenses (both operating and nonoperating) recognized by the entity in the period not otherwise specified in the income statement.

+ References

No definition available.

+ Details

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Namespace Prefix:	lea_
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Period Type:	duration

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 operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 235



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.4-08.(h)(1)(i))



-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Period Type:	duration

X

- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 835



-SubTopic 20



-Section 50



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 225



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-04.9)



-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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Balance Type:	debit
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X

- References

No definition available.

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