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Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 29, 2018 USD ($)
Goodwill [Roll Forward]
Balance at January 1, 2018	$ 1,401.3
Affiliate transaction	20.9
Foreign currency translation and other	(12.8)
Balance at September 29, 2018	1,409.4	[1]
Seating
Goodwill [Roll Forward]
Balance at January 1, 2018	1,274.4
Affiliate transaction	0.0
Foreign currency translation and other	(25.0)
Balance at September 29, 2018	1,249.4
E-Systems
Goodwill [Roll Forward]
Balance at January 1, 2018	126.9
Affiliate transaction	20.9
Foreign currency translation and other	12.2
Balance at September 29, 2018	$ 160.0
[1] Unaudited.

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- Definition

Goodwill Translation Adjustments and Other Changes

+ References

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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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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