Segment Information Income Before Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment operating income	$ 212.7	$ 208.7	$ 417.9	$ 288.7
Interest and other non-operating expenses, net	(12.4)	(15.8)	(27.9)	(32.6)
Income from equity method investments	0.1	1.6	0.7	2.9
Income before income taxes	200.4	194.5	390.7	259.0
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment operating income	221.7	207.6	425.1	279.8
Operating Segments \| Passive Safety
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment operating income	206.8	195.7	398.4	258.9
Operating Segments \| Electronics
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment operating income	14.9	11.9	26.7	20.9
Corporate and other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment operating income	$ (9.0)	$ 1.1	$ (7.2)	$ 8.9

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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