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Segment Reporting - Summary of Revenues from External Customers and Other Financial Information by Reportable Operating Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2019		Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues from external customers	$ 5,160.1		$ 5,733.7
Segment earnings	312.2		462.9
Depreciation and amortization	123.6		120.2
Capital expenditures	122.8		162.8
Total assets	12,362.0	[1]	12,681.2	$ 11,600.7
Seating
Segment Reporting Information [Line Items]
Revenues from external customers	3,913.7		4,329.9
E-Systems
Segment Reporting Information [Line Items]
Revenues from external customers	1,246.4		1,403.8
Operating segments | Seating
Segment Reporting Information [Line Items]
Revenues from external customers	3,913.7		4,329.9
Segment earnings	252.3		339.5
Depreciation and amortization	82.9		80.0
Capital expenditures	80.2		112.3
Total assets	7,702.2		7,901.5
Operating segments | E-Systems
Segment Reporting Information [Line Items]
Revenues from external customers	1,246.4		1,403.8
Segment earnings	128.3		190.8
Depreciation and amortization	36.8		36.6
Capital expenditures	39.1		48.2
Total assets	2,703.2		2,631.3
Other
Segment Reporting Information [Line Items]
Revenues from external customers	0.0		0.0
Segment earnings	(68.4)		(67.4)
Depreciation and amortization	3.9		3.6
Capital expenditures	3.5		2.3
Total assets	$ 1,956.6		$ 2,148.4
[1] Unaudited.

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