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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

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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