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Segment Reporting - Summary of Segment Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 26, 2015		Sep. 27, 2014	Sep. 26, 2015		Sep. 27, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenues from external customers	$ 4,330.3		$ 4,232.7	$ 13,486.8		$ 13,177.6
Segment earnings	302.6		224.5	848.8		672.6
Depreciation and amortization	88.0		79.9	257.4		232.6
Capital expenditures	114.8		91.7	327.7		280.8
Total assets	9,638.7	[1]	8,691.2	9,638.7	[1]	8,691.2	$ 9,150.2
Operating segments | Seating
Segment Reporting Information [Line Items]
Revenues from external customers	3,357.1		3,188.4	10,419.8		9,857.9
Segment earnings	234.2		154.9	644.8		471.3
Depreciation and amortization	60.2		50.8	177.1		148.7
Capital expenditures	75.6		63.3	232.5		192.8
Total assets	6,132.9		5,223.9	6,132.9		5,223.9
Operating segments | Electrical
Segment Reporting Information [Line Items]
Revenues from external customers	973.2		1,044.3	3,067.0		3,319.7
Segment earnings	132.6		136.7	411.5		413.3
Depreciation and amortization	25.4		27.1	73.6		78.0
Capital expenditures	26.7		24.8	75.5		82.2
Total assets	1,674.6		1,702.9	1,674.6		1,702.9
Other
Segment Reporting Information [Line Items]
Revenues from external customers	0.0		0.0	0.0		0.0
Segment earnings	(64.2)		(67.1)	(207.5)		(212.0)
Depreciation and amortization	2.4		2.0	6.7		5.9
Capital expenditures	12.5		3.6	19.7		5.8
Total assets	$ 1,831.2		$ 1,764.4	$ 1,831.2		$ 1,764.4
[1] Unaudited.

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