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Business, Basis of Presentation and Significant Accounting Policies (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
segment
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]          
Number of reportable segments | segment     5    
Revenue Recognition [Line Items]          
Unapproved change orders, description     The Company may incur costs subject to change orders, whether approved or unapproved by the customer, and/or claims related to certain contracts. Management determines the probability that such costs will be recovered based upon engineering studies and legal opinions, past practices with the customer, specific discussions, correspondence or preliminary negotiations with the customer. The Company treats project costs as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, or defers costs and/or recognizes revenue up to the amount of the related cost if it is probable that the contract price will be adjusted and can be reliably estimated.    
Unapproved change orders, expected to be billed and collected within one year, amount (in dollars) $ 20.0   $ 20.0   $ 38.0
Maximum [Member]          
Revenue Recognition [Line Items]          
Fixed price contract, percentage-of-completion method, term within which generally completed (in years)     1 year    
Change order approval process, term within which expected to be completed (in years)     1 year    
Contracts Accounted for under Percentage-of-Completion [Member] | Power Generation and Industrial [Member] | Canadian Dollars [Member]          
Revenue Recognition [Line Items]          
Project losses (in dollars)   $ 1.6   $ 17.6  
Contracts Accounted for under Percentage-of-Completion [Member] | Other [Member] | Canadian Dollars [Member] | Pacer [Member] | Joint Venture [Member]          
Revenue Recognition [Line Items]          
Project losses (in dollars)       $ 5.5  
Contracts Accounted for under Percentage-of-Completion [Member] | Maximum [Member]          
Revenue Recognition [Line Items]          
Change in accounting estimate, percentage-of-completion projects, financial effect on project profit, percentage     5.00% 5.00%  
Master Service and Other Service Agreements [Member] | Concentration Risk from Type of Arrangement [Member] | Revenue [Member]          
Revenue Recognition [Line Items]          
Concentration risk, percentage of total 45.00% 45.00% 47.00% 48.00%