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Summary of Segment Financial Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 31, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Segment Reporting Information [Line Items]
Revenues from external customers	$ 4,256.1	$ 3,917.7	$ 4,113.1	$ 3,947.1	$ 3,719.4	$ 3,538.6	$ 3,665.0	$ 3,644.0	$ 16,234.0		$ 14,567.0		$ 14,156.5
Segment earnings									736.6	[1]	705.2	[1]	679.6	[1]
Depreciation and amortization									285.5		239.5		246.3
Capital expenditures									460.6		458.3		329.5
Total assets	8,330.9				8,194.1				8,330.9		8,194.1		7,010.9
Operating Segments
Segment Reporting Information [Line Items]
Segment earnings									991.2		916.6		888.8
Operating Segments | Seating
Segment Reporting Information [Line Items]
Revenues from external customers									12,018.1		11,029.6		10,943.0
Segment earnings									576.9	[1]	661.7	[1]	703.7	[1]
Depreciation and amortization									181.3		152.6		146.5
Capital expenditures									288.5		290.7		184.0
Total assets	4,640.0				4,341.9				4,640.0		4,341.9		3,697.9
Operating Segments | Electrical
Segment Reporting Information [Line Items]
Revenues from external customers									4,215.9		3,537.4		3,213.5
Segment earnings									414.3	[1]	254.9	[1]	185.1	[1]
Depreciation and amortization									96.4		78.4		92.3
Capital expenditures									163.4		158.1		139.4
Total assets	1,658.3				1,432.2				1,658.3		1,432.2		1,255.0
Corporate and regional headquarters and elimination of intercompany activity ("Other")
Segment Reporting Information [Line Items]
Segment earnings									(254.6)	[1]	(211.4)	[1]	(209.2)	[1]
Depreciation and amortization									7.8		8.5		7.5
Capital expenditures									8.7		9.5		6.1
Total assets	$ 2,032.6				$ 2,420.0				$ 2,032.6		$ 2,420.0		$ 2,058.0
[1] See definition in Note 2, "Summary of Significant Accounting Policies - Segment Reporting."

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- Definition

Amount of pretax income or loss for the reportable segment before interest, other (income) expense, provision (benefit) for income taxes and equity in net (income) loss of affiliates.

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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