Summary of Segment Financial Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 28, 2014		Jun. 29, 2013		Jun. 28, 2014		Jun. 29, 2013		Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues from external customers	$ 4,585.1		$ 4,113.1		$ 8,944.9		$ 8,060.2
Segment earnings	232.8	[1]	201.2	[1]	448.1	[1]	375.4	[1]
Depreciation and amortization	78.2		69.0		152.7		135.4
Capital expenditures	92.6		127.7		189.1		226.4
Total assets	8,961.8	[2]	8,166.8		8,961.8	[2]	8,166.8		8,330.9
Operating Segments | Seating
Segment Reporting Information [Line Items]
Revenues from external customers	3,443.6		3,069.2		6,669.5		5,980.9
Segment earnings	164.2	[1]	166.5	[1]	316.4	[1]	307.9	[1]
Depreciation and amortization	50.4		44.1		97.9		86.7
Capital expenditures	55.6		80.1		129.5		147.6
Total assets	5,415.4		4,754.7		5,415.4		4,754.7
Operating Segments | Electrical
Segment Reporting Information [Line Items]
Revenues from external customers	1,141.5		1,043.9		2,275.4		2,079.3
Segment earnings	138.3	[1]	94.9	[1]	276.6	[1]	183.9	[1]
Depreciation and amortization	25.9		23.1		50.9		45.0
Capital expenditures	35.7		43.2		57.4		73.5
Total assets	1,797.5		1,594.8		1,797.5		1,594.8
Corporate and regional headquarters and elimination of intercompany activity ("Other")
Segment Reporting Information [Line Items]
Segment earnings	(69.7)	[1]	(60.2)	[1]	(144.9)	[1]	(116.4)	[1]
Depreciation and amortization	1.9		1.8		3.9		3.7
Capital expenditures	1.3		4.4		2.2		5.3
Total assets	$ 1,748.9		$ 1,817.3		$ 1,748.9		$ 1,817.3

[1] See definition above.

[2] Unaudited.