Segment Reporting - Summary of Segment Financial Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 27, 2014		Sep. 28, 2013		Sep. 27, 2014		Sep. 28, 2013		Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues from external customers	$ 4,232.7		$ 3,917.7		$ 13,177.6		$ 11,977.9
Segment earnings	224.5	[1]	193.0	[1]	672.6	[1]	568.4	[1]
Depreciation and amortization	79.9		72.9		232.6		208.3
Capital expenditures	91.7		102.8		280.8		329.2
Total assets	8,691.2	[2]	8,464.2		8,691.2	[2]	8,464.2		8,330.9
Operating segments | Seating
Segment Reporting Information [Line Items]
Revenues from external customers	3,188.4		2,891.7		9,857.9		8,872.6
Segment earnings	154.9	[1]	142.8	[1]	471.3	[1]	450.7	[1]
Depreciation and amortization	50.8		46.7		148.7		133.4
Capital expenditures	63.3		67.3		192.8		214.8
Total assets	5,223.9		4,862.5		5,223.9		4,862.5
Operating segments | Electrical
Segment Reporting Information [Line Items]
Revenues from external customers	1,044.3		1,026.0		3,319.7		3,105.3
Segment earnings	136.7	[1]	111.6	[1]	413.3	[1]	295.5	[1]
Depreciation and amortization	27.1		24.1		78.0		69.2
Capital expenditures	24.8		33.9		82.2		107.4
Total assets	1,702.9		1,728.9		1,702.9		1,728.9
Corporate and regional headquarters and elimination of intercompany activity ("Other")
Segment Reporting Information [Line Items]
Revenues from external customers	0		0		0		0
Segment earnings	(67.1)	[1]	(61.4)	[1]	(212.0)	[1]	(177.8)	[1]
Depreciation and amortization	2.0		2.1		5.9		5.7
Capital expenditures	3.6		1.6		5.8		7.0
Total assets	$ 1,764.4		$ 1,872.8		$ 1,764.4		$ 1,872.8

[1] See definition above.

[2] (1) Unaudited.