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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			9 Months Ended
	Sep. 28, 2019		Sep. 29, 2018	Sep. 28, 2019		Sep. 29, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues from external customers	$ 4,825.0		$ 4,891.6	$ 14,992.7		$ 16,206.1
Segment earnings	300.7		363.3	918.1		1,294.4
Depreciation and amortization	128.5		119.8	380.4		361.8
Capital expenditures	150.8		160.5	410.1		492.7
Total assets	12,753.3	[1]	12,009.4	12,753.3	[1]	12,009.4	$ 11,600.7
Seating
Segment Reporting Information [Line Items]
Revenues from external customers	3,715.0		3,683.0	11,468.1		12,287.6
E-Systems
Segment Reporting Information [Line Items]
Revenues from external customers	1,110.0		1,208.6	3,524.6		3,918.5
Operating segments | Seating
Segment Reporting Information [Line Items]
Revenues from external customers	3,715.0		3,683.0	11,468.1		12,287.6
Segment earnings	281.5		294.0	817.0		981.8
Depreciation and amortization	82.1		80.1	248.4		241.5
Capital expenditures	86.0		109.2	246.2		335.2
Total assets	7,575.3		7,311.2	7,575.3		7,311.2
Operating segments | E-Systems
Segment Reporting Information [Line Items]
Revenues from external customers	1,110.0		1,208.6	3,524.6		3,918.5
Segment earnings	74.3		138.4	287.3		504.3
Depreciation and amortization	42.5		36.1	120.2		109.6
Capital expenditures	59.8		49.8	151.4		150.4
Total assets	3,078.8		2,578.8	3,078.8		2,578.8
Other
Segment Reporting Information [Line Items]
Revenues from external customers	0.0		0.0	0.0		0.0
Segment earnings	(55.1)		(69.1)	(186.2)		(191.7)
Depreciation and amortization	3.9		3.6	11.8		10.7
Capital expenditures	5.0		1.5	12.5		7.1
Total assets	$ 2,099.2		$ 2,119.4	$ 2,099.2		$ 2,119.4
[1] Unaudited.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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