Segment Reporting - Narrative (Details) $ in Millions	3 Months Ended
	Apr. 04, 2020 USD ($) segment	Mar. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Reportable operating segments | segment	2
Restructuring charges	$ 32.6
Seating
Segment Reporting Information [Line Items]
Additional restructuring costs expected to occur	19.0
E-Systems
Segment Reporting Information [Line Items]
Additional restructuring costs expected to occur	27.0
Operating segments | Seating
Segment Reporting Information [Line Items]
Restructuring charges	12.3	$ 45.2
Operating segments | E-Systems
Segment Reporting Information [Line Items]
Restructuring charges	$ 20.3	8.9
Other
Segment Reporting Information [Line Items]
Restructuring charges		$ 0.2