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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			6 Months Ended
	Jun. 29, 2019		Jun. 30, 2018	Jun. 29, 2019		Jun. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues from external customers	$ 5,007.6		$ 5,580.8	$ 10,167.7		$ 11,314.5
Segment earnings	305.2		468.2	617.4		931.1
Depreciation and amortization	128.3		121.8	251.9		242.0
Capital expenditures	136.5		169.4	259.3		332.2
Total assets	12,847.7	[1]	12,282.4	12,847.7	[1]	12,282.4	$ 11,600.7
Seating
Segment Reporting Information [Line Items]
Revenues from external customers	3,839.4		4,274.7	7,753.1		8,604.6
E-Systems
Segment Reporting Information [Line Items]
Revenues from external customers	1,168.2		1,306.1	2,414.6		2,709.9
Operating segments | Seating
Segment Reporting Information [Line Items]
Revenues from external customers	3,839.4		4,274.7	7,753.1		8,604.6
Segment earnings	283.2		348.3	535.5		687.8
Depreciation and amortization	83.4		81.4	166.3		161.4
Capital expenditures	80.0		113.7	160.2		226.0
Total assets	7,714.0		7,508.2	7,714.0		7,508.2
Operating segments | E-Systems
Segment Reporting Information [Line Items]
Revenues from external customers	1,168.2		1,306.1	2,414.6		2,709.9
Segment earnings	84.7		175.1	213.0		365.9
Depreciation and amortization	40.9		36.9	77.7		73.5
Capital expenditures	52.5		52.4	91.6		100.6
Total assets	3,093.2		2,530.3	3,093.2		2,530.3
Other
Segment Reporting Information [Line Items]
Revenues from external customers	0.0		0.0	0.0		0.0
Segment earnings	(62.7)		(55.2)	(131.1)		(122.6)
Depreciation and amortization	4.0		3.5	7.9		7.1
Capital expenditures	4.0		3.3	7.5		5.6
Total assets	$ 2,040.5		$ 2,243.9	$ 2,040.5		$ 2,243.9
[1] Unaudited.

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