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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

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