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Investments in Affiliates and Other Related Party Transactions - Summary of Transaction with Affiliates and Other Related Parties (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transactions [Abstract]
Sales to affiliates	$ 214.7us-gaap_RevenueFromRelatedParties	$ 145.1us-gaap_RevenueFromRelatedParties	$ 93.1us-gaap_RevenueFromRelatedParties
Purchases from affiliates	32.1us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty	41.5us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty	141.9us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Management and other fees for services provided to affiliates	24.5lea_ManagementAndOtherFeesForServicesProvidedToAffiliates	22.3lea_ManagementAndOtherFeesForServicesProvidedToAffiliates	23.0lea_ManagementAndOtherFeesForServicesProvidedToAffiliates
Dividends received from affiliates	$ 25.0lea_ProceedsFromDividendsReceivedFromAffiliates	$ 17.6lea_ProceedsFromDividendsReceivedFromAffiliates	$ 14.4lea_ProceedsFromDividendsReceivedFromAffiliates

X

- Definition

The amount of management fee revenue generated for the services provided to affiliates.

+ References

No definition available.

+ Details

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X

- Definition

Proceeds from the dividends received from affiliates.

+ References

No definition available.

+ Details

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Namespace Prefix:	lea_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Details

Name:	us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ 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(e))

-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



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Related Parties

-URI http://asc.fasb.org/extlink&oid=16382449



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.6-07.1(c))

-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 07

-Paragraph b

-Subparagraph 1

-Article 6

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