Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statements of Operations
Revenue	$ 1,188.1	$ 1,237.0	$ 1,217.1
Costs and expenses:
Operating (excluding depreciation and amortization)	626.5	668.3	678.6
Selling, general and administrative	138.5	116.4	110.6
Depreciation and amortization	198.1	207.0	221.1
Impairment losses on intangibles and goodwill	147.4
Gain on sale of assets	(94.1)
Management fee to related party	1.0	1.7	1.9
Total costs and expenses	1,017.4	993.4	1,012.2
Income from operations	170.7	243.6	204.9
Other income (expense):
Interest expense	(151.6)	(211.1)	(226.0)
Realized and unrealized gain on derivative instruments		2.3	5.6
Gain on sale of Lawrence, Kansas system	38.4
Loss on early extinguishment of debt	(32.1)	(38.0)	(22.9)
Other income (expense), net	1.6	2.2	(0.4)
Income (loss) before provision for income tax	27.0	(1.0)	(38.8)
Income tax benefit (expense), net	132.5	27.3	(9.9)
Net income (loss)	$ 159.5	$ 26.3	$ (48.7)
Basic and diluted earnings (loss) per common shares
Basic (in dollars per share)	$ 2.03	$ 0.40	$ (0.76)
Diluted (in dollars per share)	$ 2.02	$ 0.40	$ (0.76)
Weighted-average common shares outstanding
Basic (in shares)	78,778,640	65,837,555	63,717,617
Diluted (in shares)	78,915,946	65,864,203	63,717,617