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Segment Reporting - Summary of Segment Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Oct. 01, 2016		Sep. 26, 2015	Oct. 01, 2016		Sep. 26, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenues from external customers	$ 4,526.4		$ 4,330.3	$ 13,914.1		$ 13,486.8
Segment earnings	345.1		302.6	1,091.4		848.8
Depreciation and amortization	98.7		88.0	283.4		257.4
Capital expenditures	118.6		114.8	300.3		327.7
Total assets	10,277.4	[1]	9,638.7	10,277.4	[1]	9,638.7	$ 9,405.8
Operating segments | Seating
Segment Reporting Information [Line Items]
Revenues from external customers	3,513.3		3,357.1	10,755.7		10,419.8
Segment earnings	269.5		234.2	848.8		644.8
Depreciation and amortization	67.9		60.2	193.8		177.1
Capital expenditures	80.3		75.6	204.6		232.5
Total assets	6,348.8		6,132.9	6,348.8		6,132.9
Operating segments | E-Systems
Segment Reporting Information [Line Items]
Revenues from external customers	1,013.1		973.2	3,158.4		3,067.0
Segment earnings	140.3		132.6	441.5		411.5
Depreciation and amortization	27.5		25.4	80.5		73.6
Capital expenditures	34.9		26.7	79.5		75.5
Total assets	1,746.6		1,674.6	1,746.6		1,674.6
Other
Segment Reporting Information [Line Items]
Revenues from external customers	0.0		0.0	0.0		0.0
Segment earnings	(64.7)		(64.2)	(198.9)		(207.5)
Depreciation and amortization	3.3		2.4	9.1		6.7
Capital expenditures	3.4		12.5	16.2		19.7
Total assets	$ 2,182.0		$ 1,831.2	$ 2,182.0		$ 1,831.2
[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
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-SubTopic 210
-Section S99
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