CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
REVENUE	$ 241.3	$ 320.2	$ 452.5	$ 694.5
COSTS AND EXPENSES:
Direct operating costs (excluding items below)	176.3	168.8	333.7	340.1
Depreciation and amortization	97.4	101.5	195.3	200.6
Selling, general and administrative	25.2	22.2	50.8	46.4
Loss on disposals of property and equipment	2.2	3.1	3.5	6.5
Total costs and expenses	301.1	295.6	583.3	593.6
Equity in earnings of unconsolidated subsidiary	1.6	0.0	0.3	0.0
INCOME (LOSS) FROM OPERATIONS	(58.2)	24.6	(130.5)	100.9
OTHER INCOME (EXPENSE):
Interest expense	(38.9)	(38.9)	(77.4)	(78.5)
Interest income	7.7	3.2	14.6	5.2
Gain on extinguishment of debt	0.0	2.4	0.0	2.2
Other - net	8.8	1.4	6.6	2.9
Total other (expense) - net	(22.4)	(31.9)	(56.2)	(68.2)
INCOME (LOSS) BEFORE INCOME TAXES	(80.6)	(7.3)	(186.7)	32.7
Provision (benefit) for income taxes	(3.9)	21.4	2.3	51.1
NET LOSS	$ (76.7)	$ (28.7)	$ (189.0)	$ (18.4)
NET LOSS PER SHARE - BASIC AND DILUTED (in dollars per share)	$ (0.60)	$ (0.23)	$ (1.49)	$ (0.15)
Weighted Average Number of Shares Outstanding, Basic and Diluted	127.0	126.3	126.8	126.0