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Revenue - Schedule of Accounts Receivable (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Jun. 30, 2018
Segment Reporting Information [Line Items]    
Total accounts receivables with customers $ 332.7 $ 375.0
Construction    
Segment Reporting Information [Line Items]    
Total accounts receivables with customers 190.1 196.6
Marine Services    
Segment Reporting Information [Line Items]    
Total accounts receivables with customers 37.7 48.3
Energy    
Segment Reporting Information [Line Items]    
Total accounts receivables with customers 5.7 3.3
Telecommunications    
Segment Reporting Information [Line Items]    
Total accounts receivables with customers 90.5 117.6
Broadcasting    
Segment Reporting Information [Line Items]    
Total accounts receivables with customers $ 8.7 $ 9.2