Segment Reporting - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Restructuring charges		$ 194.2	$ 88.0	$ 70.9
Restructuring, expected cost		55.0
United States | Pension
Segment Reporting Information [Line Items]
Settlement charge	$ (5.4)		5.4	1.7
Operating segments | Seating
Segment Reporting Information [Line Items]
Restructuring charges		150.1	62.3	45.7
Restructuring, expected cost		33.0
Operating segments | E-Systems
Segment Reporting Information [Line Items]
Restructuring charges		38.0	20.9	19.9
Restructuring, expected cost		22.0
Other
Segment Reporting Information [Line Items]
Restructuring charges		$ 2.1	$ 4.8	$ 7.9