Quarterly report pursuant to Section 13 or 15(d)

Backlog (Details)

v3.19.3
Backlog (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Construction    
Estimated Revenue From Uncompleted Contract $ 516.8 $ 505.5
Service    
Estimated Revenue From Uncompleted Contract $ 44.8 $ 54.2