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Acquisitions, Dispositions, and Deconsolidations - Construction Segment (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018 | Nov. 30, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 178.4 | $ 171.7 |
DBMG |  |  |
Business Acquisition [Line Items] |  |  |
Consideration transferred |  |  | $ 139.8
Goodwill |  |  | 50.7
DBMG | Assembled and Trained Workforce |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | $ 10.9 |  |
DBMG | GrayWolf Industrial |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition costs |  |  | $ 4.2

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