Goodwill - Summary of Changes in Carrying Amount of Goodwill (Details) $ in Millions	6 Months Ended
	Jul. 03, 2021 USD ($)
Goodwill [Roll Forward]
Balance at January 1, 2021	$ 1,655.8
Foreign currency translation and other	11.6
Balance at July 3, 2021	1,667.4	[1]
Seating
Goodwill [Roll Forward]
Balance at January 1, 2021	1,268.8
Foreign currency translation and other	(8.0)
Balance at July 3, 2021	1,260.8
E-Systems
Goodwill [Roll Forward]
Balance at January 1, 2021	387.0
Foreign currency translation and other	19.6
Balance at July 3, 2021	$ 406.6

[1] Unaudited.