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Condensed Consolidated Statements of Cash Flows (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 28, 2015
Statement of Cash Flows [Abstract]
Restricted cash disbursed for acquisition of Eagle Ottawa	$ 350.0lea_RestrictedCashDisbursementstoAcquireBusiness
Restricted cash disbursements for repurchase of senior notes	250.0lea_RestrictedCashDisbursementsforRepaymentsofSeniorDebt
Cash paid in conjunction with Eagle Ottawa acquisition to settle pre-existing accounts payable	$ 45.7lea_CashPaidtoSettleExistingAccountsPayablefromBusinessCombinationIncludedinIncreaseDecreaseinAccountsPayable

X

- Definition

Cash Paid to Settle Existing Accounts Payable from Business Combination, Included in Increase (Decrease) in Accounts Payable

+ References

No definition available.

+ Details

Name:	lea_CashPaidtoSettleExistingAccountsPayablefromBusinessCombinationIncludedinIncreaseDecreaseinAccountsPayable
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Balance Type:	credit
Period Type:	duration

X

- Definition

Restricted Cash Disbursements for Repayments of Senior Debt

+ References

No definition available.

+ Details

Name:	lea_RestrictedCashDisbursementsforRepaymentsofSeniorDebt
Namespace Prefix:	lea_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Restricted Cash Disbursements to Acquire Business

+ References

No definition available.

+ Details

Name:	lea_RestrictedCashDisbursementstoAcquireBusiness
Namespace Prefix:	lea_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

Name:	us-gaap_StatementOfCashFlowsAbstract
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Balance Type:	na
Period Type:	duration