Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Acquisitions and Divestitures Textual (Details) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2017 USD ($)	Jun. 30, 2017 businesses_acquired businesses_divested	Jun. 30, 2016 businesses_acquired businesses_divested	Jun. 30, 2017 businesses_acquired businesses_divested	Jun. 30, 2016 businesses_acquired businesses_divested
Business Acquisition [Line Items]
Divestiture activity \| businesses_divested		0	0	0	0
Acquisition activity \| businesses_acquired		1	0	1	0
Subsequent Event [Member] \| Construction Products Group
Business Acquisition [Line Items]
Business combination, consideration transferred \| $	$ 42