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Segment Reporting - Summary of Segment Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jul. 01, 2017		Jul. 02, 2016	Jul. 01, 2017		Jul. 02, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues from external customers	$ 5,123.2		$ 4,724.8	$ 10,121.7		$ 9,387.7
Segment earnings	409.1		372.8	825.8		746.3
Depreciation and amortization	104.6		94.5	201.5		184.7
Capital expenditures	153.2		93.6	274.0		181.7
Total assets	11,237.2	[1]	10,140.5	11,237.2	[1]	10,140.5	$ 9,900.6
Operating segments | Seating
Segment Reporting Information [Line Items]
Revenues from external customers	4,025.1		3,640.4	7,893.1		7,242.4
Segment earnings	322.7		287.7	643.0		579.3
Depreciation and amortization	71.5		64.6	136.5		125.9
Capital expenditures	94.7		61.9	177.4		124.3
Total assets	7,397.7		6,224.2	7,397.7		6,224.2
Operating segments | E-Systems
Segment Reporting Information [Line Items]
Revenues from external customers	1,098.1		1,084.4	2,228.6		2,145.3
Segment earnings	156.3		151.4	321.2		301.2
Depreciation and amortization	29.4		26.9	57.7		53.0
Capital expenditures	54.0		24.4	83.5		44.6
Total assets	1,880.8		1,691.4	1,880.8		1,691.4
Other
Segment Reporting Information [Line Items]
Revenues from external customers	0.0		0.0	0.0		0.0
Segment earnings	(69.9)		(66.3)	(138.4)		(134.2)
Depreciation and amortization	3.7		3.0	7.3		5.8
Capital expenditures	4.5		7.3	13.1		12.8
Total assets	$ 1,958.7		$ 2,224.9	$ 1,958.7		$ 2,224.9
[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
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-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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