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Acquisitions and Divestitures	6 Months Ended
Acquisitions and Divestitures	Jun. 30, 2017
Business Combinations [Abstract]
Acquisitions and Divestitures	Acquisitions and Divestitures In May 2017, we completed the acquisition of the assets of a lightweight aggregates business in our Construction Products Group. The purchase price of the acquisition was not significant. There was no divestiture activity for the three and six months ended June 30, 2017. There was no acquisition or divestiture activity for the three and six months ended June 30, 2016. In July 2017, we completed the acquisition of the assets of a trench shoring products business in our Construction Products Group for a total purchase price of approximately $42 million.