Segment Information Capital Expenditures (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures	$ 129.5	$ 91.8
Passive Safety
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures	101.1	72.8
Electronics
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures	27.3	16.3
Corporate and other
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures	$ 1.1	$ 2.7

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration