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Segment Reporting - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Restructuring charges	$ 88.0	$ 70.9	$ 63.6
United States | Pension
Segment Reporting Information [Line Items]
Settlement charge	5.4		34.2
Operating segments | Seating
Segment Reporting Information [Line Items]
Restructuring charges	62.3	45.7	40.6
Operating segments | E-Systems
Segment Reporting Information [Line Items]
Restructuring charges	20.9	19.9	20.1
Other
Segment Reporting Information [Line Items]
Restructuring charges	$ 4.8	$ 7.9	2.9
Other | United States | Pension
Segment Reporting Information [Line Items]
Settlement charge			$ 34.2

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