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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
	Apr. 04, 2020		Mar. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues from external customers	$ 4,457.7		$ 5,160.1
Segment earnings	173.4		312.2
Depreciation and amortization	130.5		123.6
Capital expenditures	109.1		122.8
Total assets	13,022.3	[1]	12,362.0	$ 12,680.7
Seating
Segment Reporting Information [Line Items]
Revenues from external customers	3,366.6		3,913.7
E-Systems
Segment Reporting Information [Line Items]
Revenues from external customers	1,091.1		1,246.4
Operating segments | Seating
Segment Reporting Information [Line Items]
Revenues from external customers	3,366.6		3,913.7
Segment earnings	186.1		252.3
Depreciation and amortization	83.5		82.9
Capital expenditures	66.2		80.2
Total assets	6,861.8		7,702.2
Operating segments | E-Systems
Segment Reporting Information [Line Items]
Revenues from external customers	1,091.1		1,246.4
Segment earnings	32.4		128.3
Depreciation and amortization	43.1		36.8
Capital expenditures	41.7		39.1
Total assets	2,920.3		2,703.2
Other
Segment Reporting Information [Line Items]
Revenues from external customers	0.0		0.0
Segment earnings	(45.1)		(68.4)
Depreciation and amortization	3.9		3.9
Capital expenditures	1.2		3.5
Total assets	$ 3,240.2		$ 1,956.6
[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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