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Other (Income) Expense, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Other Income and Expenses [Line Items]
Loss on extinguishment of debt			$ (21.2)	$ 0.0
Net foreign currency transaction gains (losses)	$ (5.3)	$ (3.6)	(3.9)	(5.4)
Consolidation of affiliate, revaluation gain				$ 30.3
Shanghai Lear Stec Automotive Parts Co Limited
Other Income and Expenses [Line Items]
Consolidation of affiliate, revaluation gain	54.2
4.75% Senior Notes due 2023 (2023 Notes) | Senior notes
Other Income and Expenses [Line Items]
Loss on extinguishment of debt	$ (21.2)		$ (21.2)

X

- Definition

In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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- Definition

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 50
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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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