Commitments and Contingencies - PP&E Capital Leases and Rental Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Commitments and contingencies
Rent expense for pole rental	$ 6.1	$ 5.2	$ 5.1
Franchise fees and other franchise related costs	$ 11.8	$ 13.5	$ 14.3
Minimum
Commitments and contingencies
Term of contract for licensing programming content	3 years
Maximum
Commitments and contingencies
Term of contract for licensing programming content	5 years