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Business, Basis of Presentation and Significant Accounting Policies (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
numberOfSegments
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]          
Number of reportable segments | numberOfSegments     5    
Revenue [Line Items]          
Revenue recognition, performance obligations satisfied in previous periods, revenue recognized (in dollars) $ 8.8 $ 13.3 $ 11.5 $ 52.2  
Contract with customer, unapproved change orders and/or claims, amount (in dollars) 50.0   50.0   $ 27.0
Revenue [Table]          
Accrued Payroll Taxes $ 22.0   $ 22.0    
Maximum [Member]          
Revenue [Line Items]          
Revenue recognition, changes In contract estimates, cost-to-cost method, financial effect, percentage     5.00% 5.00%  
Change order or claim approval process, term within which expected to be completed (in years)     1 year    
Revenue Benchmark [Member] | Concentration Risk from Type of Arrangement [Member] | Master Service and Other Service Agreements [Member]          
Revenue [Line Items]          
Concentration risk, percentage of total 32.00% 32.00% 36.00% 35.00%  
Revenue Benchmark [Member] | Concentration Risk from Type of Arrangement [Member] | Master Service and Other Service Agreements [Member] | Point in Time [Member]          
Revenue [Line Items]          
Concentration risk, percentage of total 4.00% 4.00% 5.00% 5.00%