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Segment Reporting - Summary of Segment Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2017		Oct. 01, 2016	Sep. 30, 2017		Oct. 01, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues from external customers	$ 4,981.5		$ 4,526.4	$ 15,103.2		$ 13,914.1
Segment earnings	385.2		345.1	1,211.0		1,091.4
Depreciation and amortization	111.7		98.7	313.2		283.4
Capital expenditures	156.2		118.6	430.2		300.3
Total assets	11,712.0	[1]	10,277.4	11,712.0	[1]	10,277.4	$ 9,900.6
Operating segments | Seating
Segment Reporting Information [Line Items]
Revenues from external customers	3,868.9		3,513.3	11,762.0		10,755.7
Segment earnings	298.8		269.5	941.8		848.8
Depreciation and amortization	76.7		67.9	213.2		193.8
Capital expenditures	109.7		80.3	287.1		204.6
Total assets	7,413.5		6,348.8	7,413.5		6,348.8
Operating segments | E-Systems
Segment Reporting Information [Line Items]
Revenues from external customers	1,112.6		1,013.1	3,341.2		3,158.4
Segment earnings	155.5		140.3	476.7		441.5
Depreciation and amortization	31.3		27.5	89.0		80.5
Capital expenditures	42.7		34.9	126.2		79.5
Total assets	2,262.7		1,746.6	2,262.7		1,746.6
Other
Segment Reporting Information [Line Items]
Revenues from external customers	0.0		0.0	0.0		0.0
Segment earnings	(69.1)		(64.7)	(207.5)		(198.9)
Depreciation and amortization	3.7		3.3	11.0		9.1
Capital expenditures	3.8		3.4	16.9		16.2
Total assets	$ 2,035.8		$ 2,182.0	$ 2,035.8		$ 2,182.0
[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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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
-Topic 230
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-Section 45
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