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Property, Plant and Equipment, net - Summary of Property, Plant and Equipment, net (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 559.6 $ 504.1
Less: Accumulated depreciation 143.2 127.8
Total 416.4 376.3
Cable-ships and submersibles    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 241.3 251.1
Equipment, furniture and fixtures, and software    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 207.1 148.0
Building and leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 48.5 47.3
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 36.9 32.8
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 13.5 12.9
Plant and transportation equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 12.3 $ 12.0