Commitments and Contingencies - Additional Information (Details) $ / shares in Units, FiberStrandMile in Millions			3 Months Ended	12 Months Ended
	Sep. 18, 2020 USD ($) FiberStrandMile FiberRoute	Sep. 09, 2020 $ / shares shares	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) Installment $ / shares	Dec. 31, 2019 USD ($) $ / shares
Commitments And Contingencies [Line Items]
Settlement of litigation			$ 650,000,000.0	$ 650,000,000
Initial fair value				$ 5,666,340,000	$ 4,929,256,000
Common stock, par value | $ / shares				$ 0.0001	$ 0.0001
Obligations under tax matters agreement				$ 0
Windstream Creditors
Commitments And Contingencies [Line Items]
Common stock agreed to sell | shares		38,633,470
Common stock, par value | $ / shares		$ 0.0001
Closing price of common stock | $ / shares		$ 6.33
Windstream
Commitments And Contingencies [Line Items]
Quarterly cash payments to be made after emergence				24,500,000
Cash payment in equal installments emergence from bankruptcy				$ 490,100,000
Number of installments | Installment				20
Percentage of committed purchase of assets				9.00%
Initial fair value				$ 438,600,000
Effective rate of payments recognized as interest expense				4.70%
Payments to acquire assets	$ 284,600,000
Dark fiber indefeasible rights of use contracts and access rights | FiberStrandMile	1.8
Fiber strand miles of fiber assets conveyed | FiberStrandMile	0.4
Fiber route miles of fiber assets conveyed | FiberRoute	4,000
Right of use asset and underlying rights of fiber strand miles | FiberStrandMile	0.4
IRU annual EBITDA from fiber strand miles conveyed	$ 28,900,000