Statements Of Consolidated Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Activities:
Net income (loss)	$ 21.5	$ 0.7	$ (67.7)
Noncash items included in net income (loss):
Depreciation and amortization	159.8	163.7	163.6
Paid-in-kind interest on Series A Notes and Series B Notes	0.0	0.4	14.3
Amortization of deferred debt costs	7.0	6.3	8.5
Amortizations of premiums and discounts on debt	1.6	2.1	27.5
Equity-based compensation and employee benefits expense	21.0	24.4	26.6
Non-union pension settlement charge	0.0	28.7	0.0
Deferred income tax benefit, net	(0.4)	(9.8)	(0.2)
(Gains) losses on property disposals, net	(14.6)	1.9	(11.9)
(Gain) loss on extinguishment of debt	0.0	0.6	(11.2)
Other noncash items, net	(2.5)	(9.0)	(5.9)
Changes in assets and liabilities, net:
Accounts receivable	(21.0)	40.7	(11.1)
Accounts payable	(1.1)	(11.1)	(5.7)
Other operating assets	10.5	(6.1)	0.3
Other operating liabilities	(78.7)	(92.7)	(98.6)
Net cash provided by operating activities	103.1	140.8	28.5
Investing Activities:
Acquisition of property and equipment	(100.6)	(108.0)	(69.2)
Proceeds from disposal of property and equipment	35.1	17.5	20.8
Restricted escrow receipts	112.1	41.9	90.7
Restricted escrow deposits	(128.9)	(75.0)	(89.1)
Proceeds from disposal of equity method investment, net	14.6	0.0	0.0
Other, net	0.0	2.2	5.2
Net cash used in investing activities	(67.7)	(121.4)	(41.6)
Financing Activities:
Issuance of long-term debt	0.0	0.0	696.8
Repayment of long-term debt	(70.7)	(16.7)	(892.7)
Debt issuance costs	(1.8)	0.0	(29.1)
Equity issuance costs	0.0	0.0	(17.1)
Equity issuance proceeds	0.0	0.0	250.0
Net cash provided by (used in) financing activities	(72.5)	(16.7)	7.9
Net Increase (Decrease) In Cash and Cash Equivalents	(37.1)	2.7	(5.2)
Cash and Cash Equivalents, Beginning of Year	173.8	171.1	176.3
Cash and Cash Equivalents, End of Year	136.7	173.8	171.1
Supplemental Cash Flow Information:
Interest paid	(90.2)	(104.5)	(129.1)
Letter of credit fees paid	(8.5)	(8.8)	(8.7)
Income tax refund (payment), net	(6.8)	(6.2)	16.1
Debt redeemed for equity consideration	$ 0.0	$ 17.9	$ 51.8