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Segment Reporting - Summary of Segment Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jul. 02, 2016		Jun. 27, 2015	Jul. 02, 2016		Jun. 27, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenues from external customers	$ 4,724.8		$ 4,635.1	$ 9,387.7		$ 9,156.5
Segment earnings	372.8		285.5	746.3		546.2
Depreciation and amortization	94.5		84.9	184.7		169.4
Capital expenditures	93.6		114.1	181.7		212.9
Total assets	10,140.5	[1]	9,825.4	10,140.5	[1]	9,825.4	$ 9,405.8
Operating segments | Seating
Segment Reporting Information [Line Items]
Revenues from external customers	3,640.4		3,577.7	7,242.4		7,062.7
Segment earnings	287.7		214.5	579.3		410.6
Depreciation and amortization	64.6		58.6	125.9		116.9
Capital expenditures	61.9		85.4	124.3		156.9
Total assets	6,224.2		6,302.5	6,224.2		6,302.5
Operating segments | Electrical
Segment Reporting Information [Line Items]
Revenues from external customers	1,084.4		1,057.4	2,145.3		2,093.8
Segment earnings	151.4		141.9	301.2		278.9
Depreciation and amortization	26.9		24.1	53.0		48.2
Capital expenditures	24.4		23.5	44.6		48.8
Total assets	1,691.4		1,657.7	1,691.4		1,657.7
Other
Segment Reporting Information [Line Items]
Revenues from external customers	0.0		0.0	0.0		0.0
Segment earnings	(66.3)		(70.9)	(134.2)		(143.3)
Depreciation and amortization	3.0		2.2	5.8		4.3
Capital expenditures	7.3		5.2	12.8		7.2
Total assets	$ 2,224.9		$ 1,865.2	$ 2,224.9		$ 1,865.2
[1] Unaudited.

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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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