CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CONSOLIDATED STATEMENTS OF OPERATIONS
Revenue	$ 1,148.4	$ 1,145.8	$ 1,153.8
Costs and expenses:
Operating (excluding depreciation and amortization)	570.2	575.8	617.9
Selling, general and administrative	182.5	172.3	155.2
Depreciation and amortization	230.6	206.2	186.9
Impairment losses on intangibles and goodwill	14.0	9.7	216.3
Loss (gain) on sale of operating assets, net		5.4	(0.9)
Total costs and expenses	997.3	969.4	1,175.4
Income from operations	151.1	176.4	(21.6)
Other income (expense):
Interest expense	(130.7)	(142.1)	(132.5)
Other income, net	1.8	3.6	1.7
Income before provision for income tax	22.2	37.9	(152.4)
Income tax (expense) benefit	(7.8)	(1.5)	65.1
Net income (loss)	$ 14.4	$ 36.4	$ (87.3)
Basic and diluted earnings per common share
Basic (in dollars per share)	$ 0.18	$ 0.45	$ (1.07)
Diluted (in dollars per share)	$ 0.17	$ 0.45	$ (1.07)
Weighted-average common shares outstanding
Basic (in shares)	81,561,707	80,713,926	81,808,425
Diluted (in shares)	82,814,810	81,189,162	81,808,425