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Goodwill - Summary of Changes in Carrying Amount of Goodwill (Details) $ in Millions	3 Months Ended
	Apr. 04, 2020 USD ($)
Goodwill [Roll Forward]
Balance at January 1, 2020	$ 1,614.3
Foreign currency translation and other	(22.1)
Balance at April 4, 2020	1,592.2	[1]
Seating
Goodwill [Roll Forward]
Balance at January 1, 2020	1,235.4
Foreign currency translation and other	(20.0)
Balance at April 4, 2020	1,215.4
E-Systems
Goodwill [Roll Forward]
Balance at January 1, 2020	378.9
Foreign currency translation and other	(2.1)
Balance at April 4, 2020	$ 376.8
[1] Unaudited.

X

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

+ Details

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X

- Definition

Amount of increase (decrease) 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 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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X

- Definition

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

+ References

No definition available.

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