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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

X

- 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

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No definition available.

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