CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
REVENUES	$ 320.2	$ 611.8	$ 694.5	$ 1,112.0
COSTS AND EXPENSES:
Direct operating costs (excluding items below)	167.5	207.5	337.5	412.3
Depreciation and amortization	101.5	100.1	200.6	199.0
Selling, general and administrative	22.0	26.1	46.0	53.0
Loss on disposals of property and equipment	3.1	1.9	6.5	4.1
Total costs and expenses	294.1	335.6	590.6	668.4
INCOME FROM OPERATIONS	26.1	276.2	103.9	443.6
OTHER INCOME (EXPENSE):
Interest expense	(38.9)	(38.3)	(78.5)	(77.2)
Interest income	3.2	0.5	5.2	0.9
Gain on extinguishment of debt	2.4	1.8	2.2	2.4
Other - net	(0.1)	(0.7)	(0.1)	(3.3)
Total other (expense), net	(33.4)	(36.7)	(71.2)	(77.2)
INCOME (LOSS) BEFORE INCOME TAXES	(7.3)	239.5	32.7	366.4
Provision for income taxes	21.4	22.8	51.1	26.9
NET INCOME (LOSS)	$ (28.7)	$ 216.7	$ (18.4)	$ 339.5
NET INCOME (LOSS) PER SHARE - BASIC (in dollars per share)	$ (0.23)	$ 1.73	$ (0.15)	$ 2.71
NET INCOME (LOSS) PER SHARE - DILUTED (in dollars per share)	$ (0.23)	$ 1.72	$ (0.15)	$ 2.70