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Other (Income) Expense, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015
Business Acquisition [Line Items]
Net foreign currency transaction gains (losses)	$ (3.6)	$ (13.6)	$ (5.4)	$ (27.9)
Gain (loss) on extinguishment of debt				$ (14.3)
Beijing BAI Lear Automotive Systems Co., Ltd.
Business Acquisition [Line Items]
Gain on consolidation of affiliate			$ 30.3

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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.

+ References

No definition available.

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

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

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