Segment Information Sales Including Intersegment Sales (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 2,174.1	$ 2,295.8
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	2,181.6	2,306.3
Operating Segments | Passive Safety
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	1,830.4	1,951.5
Operating Segments | Electronics
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	351.2	354.8
Corporate and other
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	4.2	4.0
Intersegment Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ (11.7)	$ (14.5)