Segment Information Capital Expenditures (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures	$ 97.7	$ 118.4	$ 347.7	$ 326.8
Corporate and other
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures	1.1	1.3	4.1	1.7
Passive Safety
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures	84.2	97.3	306.5	274.8
Electronics
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures	$ 12.4	$ 19.8	$ 37.1	$ 50.3