Accrued Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Accrued Liabilities
Programming costs	$ 35.1	$ 32.2
Franchise, copyright and revenue sharing fees	11.9	12.2
Payroll and employee benefits	18.6	11.5
Construction	5.8	7.5
Property, income, sales and use taxes	10.5	18.9
Utility pole rentals	2.4	1.5
Other accrued liabilities	14.1	10.7
Accrued Liabilities	$ 98.4	$ 94.5