Segment Information Depreciation and Amortization (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reconciliation of Depreciation by Segment [Line Items]
Depreciation and amortization	$ 80.1	$ 77.4	$ 229.6	$ 228.0
Corporate and other
Reconciliation of Depreciation by Segment [Line Items]
Depreciation and amortization	1.2	1.4	3.4	4.3
Passive Safety
Reconciliation of Depreciation by Segment [Line Items]
Depreciation and amortization	67.1	64.5	192.6	190.7
Electronics
Reconciliation of Depreciation by Segment [Line Items]
Depreciation and amortization	$ 11.8	$ 11.5	$ 33.6	$ 33.0