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Segment Reporting - Summary of Segment Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018		Apr. 01, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues from external customers	$ 5,733.7		$ 4,998.5
Segment earnings	462.9		416.7
Depreciation and amortization	120.2		96.9
Capital expenditures	162.8		120.8
Total assets	12,681.2	[1]	10,600.5	$ 11,945.9
Operating segments | Seating
Segment Reporting Information [Line Items]
Revenues from external customers	4,329.9		3,868.0
Segment earnings	339.5		320.3
Depreciation and amortization	80.0		65.0
Capital expenditures	112.3		82.7
Total assets	7,901.5		6,824.5
Operating segments | E-Systems
Segment Reporting Information [Line Items]
Revenues from external customers	1,403.8		1,130.5
Segment earnings	190.8		164.9
Depreciation and amortization	36.6		28.3
Capital expenditures	48.2		29.5
Total assets	2,631.3		1,835.7
Other
Segment Reporting Information [Line Items]
Revenues from external customers	0.0		0.0
Segment earnings	(67.4)		(68.5)
Depreciation and amortization	3.6		3.6
Capital expenditures	2.3		8.6
Total assets	$ 2,148.4		$ 1,940.3
[1] Unaudited.

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Amount of pretax income or loss for the reportable segment before interest, other (income) expense, provision (benefit) for income taxes and equity in net (income) loss of affiliates.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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