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Commitments and Contingencies - Summary of Changes in Reserves for Product Liability and Warranty Claims (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning Balance	$ 28.3us-gaap_StandardProductWarrantyAccrual	$ 22.7us-gaap_StandardProductWarrantyAccrual
Expense, net, including changes in estimates	11.4lea_StandardProductWarrantyAccrualIncreaseDecrease	15.2lea_StandardProductWarrantyAccrualIncreaseDecrease
Settlements	(9.3)us-gaap_StandardProductWarrantyAccrualPayments	(9.1)us-gaap_StandardProductWarrantyAccrualPayments
Ending Balance	28.9us-gaap_StandardProductWarrantyAccrual	28.3us-gaap_StandardProductWarrantyAccrual
Standard Product Warranty Accrual Currency Translation, Other Increase Decrease	$ (1.5)lea_StandardProductWarrantyAccrualCurrencyTranslationOtherIncreaseDecrease	$ (0.5)lea_StandardProductWarrantyAccrualCurrencyTranslationOtherIncreaseDecrease

X

- Definition

Standard Product Warranty Accrual Currency Translation, Other Increase (Decrease)

+ References

No definition available.

+ Details

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

X

- Definition

Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to product warranties (including adjustments related to changes in estimates).

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_MovementInStandardProductWarrantyAccrualRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)(1),(c)(5)

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

+ Details

Name:	us-gaap_StandardProductWarrantyAccrual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty. Does not include any Increase or Decrease in the liability for payments related to extended product warranties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(2))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

+ Details

Name:	us-gaap_StandardProductWarrantyAccrualPayments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration