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Revenue - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers $ 439.9 $ 455.0 $ 844.8 $ 870.5
Operating Segments        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers 439.9 455.0 844.8 870.5
Operating Segments | Construction        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers 195.5 176.9 387.6 335.9
Operating Segments | Marine Services        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers 39.4 68.4 81.8 105.1
Operating Segments | Energy        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers   7.1   11.6
Operating Segments | Telecommunications        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers 189.3 190.5 344.8 392.8
Operating Segments | Broadcasting        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers $ 10.0 11.1 $ 19.8 21.7
Operating Segments | Other        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers   $ 1.0   $ 3.4