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Segment Reporting - Summary of Segment Financial Information (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018		Jul. 01, 2017	Jun. 30, 2018		Jul. 01, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues from external customers	$ 5,580.8		$ 5,123.2	$ 11,314.5		$ 10,121.7
Segment earnings	468.2		409.1	931.1		825.8
Depreciation and amortization	121.8		104.6	242.0		201.5
Capital expenditures	169.4		153.2	332.2		274.0
Total assets	12,282.4	[1]	11,237.2	12,282.4	[1]	11,237.2	$ 11,945.9
Seating
Segment Reporting Information [Line Items]
Revenues from external customers	4,274.7		4,025.1	8,604.6		7,893.1
E-Systems
Segment Reporting Information [Line Items]
Revenues from external customers	1,306.1		1,098.1	2,709.9		2,228.6
Operating segments | Seating
Segment Reporting Information [Line Items]
Revenues from external customers	4,274.7		4,025.1	8,604.6		7,893.1
Segment earnings	348.3		322.7	687.8		643.0
Depreciation and amortization	81.4		71.5	161.4		136.5
Capital expenditures	113.7		94.7	226.0		177.4
Total assets	7,508.2		7,397.7	7,508.2		7,397.7
Operating segments | E-Systems
Segment Reporting Information [Line Items]
Revenues from external customers	1,306.1		1,098.1	2,709.9		2,228.6
Segment earnings	175.1		156.3	365.9		321.2
Depreciation and amortization	36.9		29.4	73.5		57.7
Capital expenditures	52.4		54.0	100.6		83.5
Total assets	2,530.3		1,880.8	2,530.3		1,880.8
Other
Segment Reporting Information [Line Items]
Revenues from external customers	0.0		0.0	0.0		0.0
Segment earnings	(55.2)		(69.9)	(122.6)		(138.4)
Depreciation and amortization	3.5		3.7	7.1		7.3
Capital expenditures	3.3		4.5	5.6		13.1
Total assets	$ 2,243.9		$ 1,958.7	$ 2,243.9		$ 1,958.7
[1] Unaudited.

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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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