Statements Of Consolidated Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities:
Net income (loss)	$ (10.8)	$ 21.5	$ 0.7
Noncash items included in net income (loss):
Depreciation and amortization	147.7	159.8	163.7
Noncash equity-based compensation and employee benefits expense	22.0	21.0	24.4
Non-union pension settlement charge	7.6	0.0	28.7
Deferred income tax benefit, net	(13.2)	(0.4)	(9.8)
(Gains) losses on property disposals, net	(0.6)	(14.6)	1.9
Other noncash items, net	13.2	6.1	0.4
Changes in assets and liabilities, net:
Accounts receivable	(38.6)	(21.0)	40.7
Accounts payable	10.9	(1.1)	(11.1)
Other operating assets	14.9	10.5	(6.1)
Other operating liabilities	(92.4)	(78.0)	(85.9)
Net cash provided by operating activities	60.7	103.8	147.6
Investing Activities:
Acquisition of property and equipment	(103.3)	(100.6)	(108.0)
Proceeds from disposal of property and equipment	8.8	35.1	17.5
Restricted escrow receipts	94.9	112.1	41.9
Restricted escrow deposits	(10.0)	(128.9)	(75.0)
Proceeds from disposal of equity method investment, net	0.0	14.6	0.0
Other, net	0.0	0.0	2.2
Net cash used in investing activities	(9.6)	(67.7)	(121.4)
Financing Activities:
Repayment of long-term debt	(79.3)	(70.7)	(16.7)
Debt issuance costs	(14.5)	(1.8)	0.0
Payments for tax withheld on equity-based compensation	(2.4)	(0.7)	(6.8)
Net cash used in financing activities	(96.2)	(73.2)	(23.5)
Net Increase (Decrease) In Cash and Cash Equivalents	(45.1)	(37.1)	2.7
Cash and Cash Equivalents, Beginning of Year	136.7	173.8	171.1
Cash and Cash Equivalents, End of Year	91.6	136.7	173.8
Supplemental Cash Flow Information:
Interest paid	(103.4)	(90.2)	(104.5)
Letter of credit fees paid	(7.0)	(8.5)	(8.8)
Income tax refund (payment), net	1.7	(6.8)	(6.2)
Debt redeemed for equity consideration	$ 0.0	$ 0.0	$ 17.9