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Revenue - Schedule of Accounts Receivable (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]    
Total accounts receivables with customers $ 375.0 $ 322.1
Construction    
Segment Reporting Information [Line Items]    
Total accounts receivables with customers 196.6 162.6
Marine Services    
Segment Reporting Information [Line Items]    
Total accounts receivables with customers 48.3 48.7
Energy    
Segment Reporting Information [Line Items]    
Total accounts receivables with customers 3.3 3.7
Telecommunications    
Segment Reporting Information [Line Items]    
Total accounts receivables with customers 117.6 91.7
Broadcasting    
Segment Reporting Information [Line Items]    
Total accounts receivables with customers 9.2 10.8
Other    
Segment Reporting Information [Line Items]    
Total accounts receivables with customers $ 0.0 $ 4.6