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Segment Reporting - Summary of Segment Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 27, 2015		Jun. 28, 2014	Jun. 27, 2015		Jun. 28, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenues from external customers	$ 4,635.1		$ 4,585.1	$ 9,156.5		$ 8,944.9
Segment earnings	285.5		232.8	546.2		448.1
Depreciation and amortization	84.9		78.2	169.4		152.7
Capital expenditures	114.1		92.6	212.9		189.1
Total assets	9,825.4	[1]	8,961.8	9,825.4	[1]	8,961.8	$ 9,150.2
Operating segments | Seating
Segment Reporting Information [Line Items]
Revenues from external customers	3,577.7		3,443.6	7,062.7		6,669.5
Segment earnings	214.5		164.2	410.6		316.4
Depreciation and amortization	58.6		50.4	116.9		97.9
Capital expenditures	85.4		55.6	156.9		129.5
Total assets	6,302.5		5,415.4	6,302.5		5,415.4
Operating segments | Electrical
Segment Reporting Information [Line Items]
Revenues from external customers	1,057.4		1,141.5	2,093.8		2,275.4
Segment earnings	141.9		138.3	278.9		276.6
Depreciation and amortization	24.1		25.9	48.2		50.9
Capital expenditures	23.5		35.7	48.8		57.4
Total assets	1,657.7		1,797.5	1,657.7		1,797.5
Other
Segment Reporting Information [Line Items]
Revenues from external customers	0.0		0.0	0.0		0.0
Segment earnings	(70.9)		(69.7)	(143.3)		(144.9)
Depreciation and amortization	2.2		1.9	4.3		3.9
Capital expenditures	5.2		1.3	7.2		2.2
Total assets	$ 1,865.2		$ 1,748.9	$ 1,865.2		$ 1,748.9
[1] Unaudited.

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