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Revisions in Estimates (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
project
Jun. 30, 2016
USD ($)
project
Jun. 30, 2017
USD ($)
project
Jun. 30, 2016
USD ($)
project
Change in Accounting Estimates        
Impact From Affirmative Claim Recovery Estimate $ 12.2 $ 17.4 $ 14.0 $ 20.2
Impact From Estimated Recovery of Backcharge Claims 2.7 7.6 3.0 7.6
Construction Segment        
Change in Accounting Estimates        
Change in Accounting Estimate Amount Considered Significant to Individual Project Gross Profit 1.0 1.0 1.0 1.0
Net Downward Estimate Change [Member] | Construction Segment        
Change in Accounting Estimates        
Increase (Decrease) on Project Profitability (1.1) (1.0) (1.8) (2.5)
Net Downward Estimate Change [Member] | Large Project Construction [Member]        
Change in Accounting Estimates        
Increase (Decrease) on Project Profitability (23.8) (4.8) (37.8) (7.8)
Upward Estimate Changes | Construction Segment | Minimum        
Change in Accounting Estimates        
Range Of Effect On Gross Profit 0.0 0.0 0.0 0.0
Upward Estimate Changes | Construction Segment | Maximum        
Change in Accounting Estimates        
Range Of Effect On Gross Profit $ 0.0 $ 0.0 $ 0.0 $ 0.0
Upward Estimate Changes | Large Project Construction [Member]        
Change in Accounting Estimates        
Number of Projects with Estimate Changes | project 0 2 0 4
Increase (Decrease) on Project Profitability $ 0.0 $ 9.8 $ 0.0 $ 12.3
Upward Estimate Changes | Large Project Construction [Member] | Minimum        
Change in Accounting Estimates        
Range Of Effect On Gross Profit 0.0 2.9 0.0 1.2
Upward Estimate Changes | Large Project Construction [Member] | Maximum        
Change in Accounting Estimates        
Range Of Effect On Gross Profit 0.0 6.9 0.0 6.9
Contracts Accounted for under Percentage of Completion [Member] | Large Project Construction [Member] | Noncontrolling Interest [Member]        
Change in Accounting Estimates        
Increase (Decrease) on Project Profitability $ (0.4) $ (3.6) $ (2.0) $ (3.6)
Downward Estimate Change [Member] | Construction Segment        
Change in Accounting Estimates        
Number of Projects with Estimate Changes | project 1 1 1 2
Increase (Decrease) on Project Profitability $ (1.1)   $ (1.8)  
Downward Estimate Change [Member] | Construction Segment | Minimum        
Change in Accounting Estimates        
Range Of Effect On Gross Profit (1.1) $ (1.0) (1.8) $ (1.2)
Downward Estimate Change [Member] | Construction Segment | Maximum        
Change in Accounting Estimates        
Range Of Effect On Gross Profit $ (1.1) $ (1.0) $ (1.8) $ (1.3)
Downward Estimate Change [Member] | Large Project Construction [Member]        
Change in Accounting Estimates        
Number of Projects with Estimate Changes | project 5 4 7 4
Increase (Decrease) on Project Profitability $ (23.8) $ (14.6) $ (37.8) $ (20.1)
Downward Estimate Change [Member] | Large Project Construction [Member] | Minimum        
Change in Accounting Estimates        
Range Of Effect On Gross Profit (1.1) (2.2) (1.0) (3.4)
Downward Estimate Change [Member] | Large Project Construction [Member] | Maximum        
Change in Accounting Estimates        
Range Of Effect On Gross Profit (8.1) (5.9) (10.8) (6.4)
Estimated costs recorded in prior period        
Change in Accounting Estimates        
Impact From Affirmative Claim Recovery Estimate 0.8 2.1 (0.1) 4.9
Impact From Estimated Recovery of Backcharge Claims 1.3 5.4 1.6 5.4
Revisions to estimated total contract costs        
Change in Accounting Estimates        
Impact From Affirmative Claim Recovery Estimate 11.4 15.3 14.1 15.3
Impact From Estimated Recovery of Backcharge Claims $ 1.4 $ 2.2 $ 1.4 2.2
Sales Revenue, Net        
Change in Accounting Estimates        
Misstatement in prior period filing       4.9
Gross Profit        
Change in Accounting Estimates        
Misstatement in prior period filing       $ 1.6