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Property, Plant and Equipment, net - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]      
Depreciation expense $ 28.9 $ 26.8 $ 9.8
Depreciation expense with cost of revenue 4.4 7.9 $ 4.3
Cable-ships and submersibles      
Property, Plant and Equipment [Line Items]      
Net book value of equipment under capital leases $ 51.0 $ 66.8