Goodwill - Summary of Changes in Carrying Amount of Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 29, 2019 USD ($)
Goodwill [Roll Forward]
Balance at January 1, 2019	$ 1,405.3
Acquisition	197.5
Foreign currency translation and other	(2.6)
Balance at June 29, 2019	1,600.2	[1]
Seating
Goodwill [Roll Forward]
Balance at January 1, 2019	1,244.3
Acquisition	0.0
Foreign currency translation and other	(2.4)
Balance at June 29, 2019	1,241.9
E-Systems
Goodwill [Roll Forward]
Balance at January 1, 2019	161.0
Acquisition	197.5
Foreign currency translation and other	(0.2)
Balance at June 29, 2019	$ 358.3

[1] Unaudited.