Segment Information Sales Including Intersegment Sales (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 2,184.5	$ 2,208.0	$ 6,650.1	$ 6,886.8
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	2,194.3	2,219.8	6,678.3	6,920.5
Operating Segments | Passive Safety
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	1,797.2	1,862.9	5,552.9	5,828.3
Operating Segments | Electronics
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	397.1	356.9	1,125.4	1,092.2
Corporate and other
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	3.9	5.0	11.1	14.1
Intersegment Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ (13.7)	$ (16.8)	$ (39.3)	$ (47.8)