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Commitments and Contingencies - Legal Proceedings (Details) - USD ($) $ in Millions		1 Months Ended		3 Months Ended			12 Months Ended	52 Months Ended
	Jul. 01, 2019	Apr. 30, 2019	Feb. 28, 2019	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2017	Dec. 31, 2015	Apr. 30, 2019
Lorenzo Benton v Telecom Network Specialists Inc | Maximum
Loss Contingencies [Line Items]
Reasonably possible amount of loss				$ 9.1
Damages awarded			$ 7.5
Disputed Contract Termination
Loss Contingencies [Line Items]
Charge to earnings related to legal proceedings					$ 79.2
Net receivable position on projects				120.0
Redes | Telecommunication Networks Construction and Operation
Loss Contingencies [Line Items]
Term of post-construction operation and maintenance period							10 years
Redes | Disputed Contract Termination
Loss Contingencies [Line Items]
Advance payments received								$ 87.0
On-demand performance bonds							$ 25.0
Construction costs incurred								157.0
Payments received on construction contracts								$ 100.0
Redes | Disputed Contract Termination | Telecommunication Networks Construction and Operation
Loss Contingencies [Line Items]
Aggregate consideration for projects							248.0
Aggregate consideration to be paid during the construction period							151.0
Aggregate consideration to be paid during the post-construction operation and maintenance period							$ 97.0
PRONATEL | Disputed Contract Termination
Loss Contingencies [Line Items]
Damages sought		$ 45.0
Bond proceeds received		$ 112.0
Amount collected through exercise of advance payment bonds				$ 87.0
QPS | Maurepas Project Dispute
Loss Contingencies [Line Items]
Damages sought						$ 22.0
Maurepas | Maurepas Project Dispute
Loss Contingencies [Line Items]
Damages sought	$ 59.0

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