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	Jun. 30, 2019	Sep. 30, 2017	Dec. 31, 2015	Apr. 30, 2019	Mar. 31, 2020
Lorenzo Benton v Telecom Network Specialists Inc | Maximum
Loss Contingencies [Line Items]
Damages awarded			$ 7.5
Reasonably possible amount of loss								$ 9.1
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							155.0
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
QPS Engineering, LLC | Maurepas Project Dispute
Loss Contingencies [Line Items]
Damages sought					$ 22.0
PRONATEL | Disputed Contract Termination
Loss Contingencies [Line Items]
Damages sought		$ 45.0
Bond proceeds received		$ 112.0
Maurepas | Maurepas Project Dispute
Loss Contingencies [Line Items]
Damages sought	$ 59.0