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Other Expense, Net - Summary of Other (Income) Expense, Net (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 28, 2015 | Mar. 29, 2014
Other Income and Expenses [Abstract] |  |
Other expense | $ 32.3 us-gaap_OtherExpenses | $ 29.8 us-gaap_OtherExpenses
Other income | (2.3)us-gaap_OtherIncome | (0.6)us-gaap_OtherIncome
Other expense, net | $ 30.0 lea_OtherIncomeExpenseNet | $ 29.2 lea_OtherIncomeExpenseNet

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- 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
Name: | lea_OtherIncomeExpenseNet
Namespace Prefix: | lea_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This element represents a sum total of expenses not separately reflected on the income statement for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.7) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4,6) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_OtherExpenses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
Name: | us-gaap_OtherIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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