CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
REVENUE	$ 192.9	$ 291.6	$ 645.4	$ 986.1
COSTS AND EXPENSES:
Direct operating costs (excluding items below)	182.3	168.7	516.0	508.8
Depreciation and amortization	99.0	103.4	294.3	304.0
Selling, general and administrative	26.6	24.9	77.4	71.3
Loss on disposals of property and equipment	1.5	2.8	5.0	9.3
Total costs and expenses	309.4	299.8	892.7	893.4
Equity in earnings of unconsolidated subsidiary	3.1	0.0	3.4	0.0
INCOME (LOSS) FROM OPERATIONS	(113.4)	(8.2)	(243.9)	92.7
OTHER INCOME (EXPENSE):
Interest expense	(39.2)	(38.5)	(116.6)	(117.0)
Interest income	8.0	3.7	22.6	8.9
Gain (loss) on extinguishment of debt	0.0	(0.5)	0.0	1.7
Other - net	4.0	0.8	10.6	3.7
Total other (expense) - net	(27.2)	(34.5)	(83.4)	(102.7)
LOSS BEFORE INCOME TAXES	(140.6)	(42.7)	(327.3)	(10.0)
Provision (benefit) for income taxes	3.5	(21.8)	5.8	29.3
NET LOSS	$ (144.1)	$ (20.9)	$ (333.1)	$ (39.3)
NET LOSS PER SHARE - BASIC AND DILUTED (in dollars per share)	$ (1.13)	$ (0.17)	$ (2.63)	$ (0.31)
Weighted Average Number of Shares Outstanding, Basic and Diluted	127.1	126.2	126.9	126.1