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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
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Related Party Transactions [Abstract] |  |  |
Sales to affiliates | $ 214.7 us-gaap_RevenueFromRelatedParties | $ 145.1 us-gaap_RevenueFromRelatedParties | $ 93.1 us-gaap_RevenueFromRelatedParties
Purchases from affiliates | 32.1 us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty | 41.5 us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty | 141.9 us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Management and other fees for services provided to affiliates | 24.5 lea_ManagementAndOtherFeesForServicesProvidedToAffiliates | 22.3 lea_ManagementAndOtherFeesForServicesProvidedToAffiliates | 23.0 lea_ManagementAndOtherFeesForServicesProvidedToAffiliates
Dividends received from affiliates | $ 25.0 lea_ProceedsFromDividendsReceivedFromAffiliates | $ 17.6 lea_ProceedsFromDividendsReceivedFromAffiliates | $ 14.4 lea_ProceedsFromDividendsReceivedFromAffiliates

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- Definition The amount of management fee revenue generated for the services provided to affiliates. + References No definition available. + Details
Name: | lea_ManagementAndOtherFeesForServicesProvidedToAffiliates
Namespace Prefix: | lea_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Proceeds from the dividends received from affiliates. + References No definition available. + Details
Name: | lea_ProceedsFromDividendsReceivedFromAffiliates
Namespace Prefix: | lea_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration