Segment Information Depreciation and Amortization (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reconciliation of Depreciation by Segment [Line Items]
Depreciation and amortization	$ 114.8	$ 85.1
Passive Safety
Reconciliation of Depreciation by Segment [Line Items]
Depreciation and amortization	73.1	68.3
Electronics
Reconciliation of Depreciation by Segment [Line Items]
Depreciation and amortization	38.8	14.7
Corporate and other
Reconciliation of Depreciation by Segment [Line Items]
Depreciation and amortization	$ 2.9	$ 2.1