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Goodwill (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Goodwill [Roll Forward]
Balance at January 1, 2018	$ 1,401.3
Affiliate transaction	20.9
Foreign currency translation and other	(0.8)
Balance at June 30, 2018	1,421.4	[1]
Operating segments | Seating
Goodwill [Roll Forward]
Balance at January 1, 2018	1,274.4
Affiliate transaction	0.0
Foreign currency translation and other	(17.1)
Balance at June 30, 2018	1,257.3
Operating segments | E-Systems
Goodwill [Roll Forward]
Balance at January 1, 2018	126.9
Affiliate transaction	20.9
Foreign currency translation and other	16.3
Balance at June 30, 2018	$ 164.1
[1] Unaudited.

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Goodwill Translation Adjustments and Other Changes

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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