Revenue - Marine Segment Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenue	$ 1,662.7	$ 1,774.1
Net revenue	1,984.1	1,976.7
Marine Services
Segment Reporting Information [Line Items]
Revenue	172.5	194.3
Other revenue	0.0	0.0
Net revenue	172.5	194.3
Telecommunication - Maintenance \| Marine Services
Segment Reporting Information [Line Items]
Revenue	86.8	87.0
Telecommunication - Installation \| Marine Services
Segment Reporting Information [Line Items]
Revenue	33.2	41.5
Power - Operations, Maintenance & Construction Support \| Marine Services
Segment Reporting Information [Line Items]
Revenue	19.9	31.0
Power - Cable Installation & Repair \| Marine Services
Segment Reporting Information [Line Items]
Revenue	$ 32.6	$ 34.8

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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