Segment Information Segment Assets (Detail) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets		$ 7,293.4	$ 7,442.9
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets		6,395.4	6,496.2
Operating Segments | Passive Safety
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets		5,451.8	5,782.3
Operating Segments | Electronics
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets		943.6	713.9
Corporate and other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	[1]	$ 898.0	$ 946.7

[1] Corporate and other assets mainly consist of cash and cash equivalents, income taxes and equity method investments.