Segment Information Capital Expenditures (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures	$ 131.7	$ 115.2	$ 223.5	$ 250.0
Corporate and other
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures	3.5	0.9	6.3	2.9
Passive Safety
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures	100.5	101.2	173.3	222.4
Electronics
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures	$ 27.7	$ 13.1	$ 43.9	$ 24.7