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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