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Subsequent Event (Details) - USD ($)
$ in Millions
Apr. 30, 2019
Mar. 31, 2019
Disputed Contract Termination | PRONATEL | Subsequent Event    
Subsequent Event [Line Items]    
Claim for on demand bonds exercised $ 25.0  
Telecommunication Networks Construction and Operation    
Subsequent Event [Line Items]    
Aggregate consideration for projects   $ 260.0
Telecommunication Networks Construction    
Subsequent Event [Line Items]    
Aggregate consideration for projects   $ 182.0
Percent of project completion   85.00%
Net receivable position on projects   $ 54.9