Segment Information Depreciation and Amortization (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reconciliation of Depreciation by Segment [Line Items]
Depreciation and amortization	$ 96.7	$ 75.8	$ 181.8	$ 149.5
Corporate and other
Reconciliation of Depreciation by Segment [Line Items]
Depreciation and amortization	2.2	1.0	4.4	2.2
Passive Safety
Reconciliation of Depreciation by Segment [Line Items]
Depreciation and amortization	69.4	63.7	137.6	125.5
Electronics
Reconciliation of Depreciation by Segment [Line Items]
Depreciation and amortization	$ 25.1	$ 11.1	$ 39.8	$ 21.8