Statements of Consolidated Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating Activities:
Net income (loss)	$ (6.3)	$ 15.1
Noncash items included in net income (loss):
Depreciation and amortization	74.3	79.2
Noncash equity-based compensation and employee benefits expense	11.7	11.3
(Gains) losses on property disposals, net	1.7	(11.4)
Gain on disposal of equity method investment	0.0	(2.3)
Other noncash items, net	6.8	6.4
Changes in assets and liabilities, net:
Accounts receivable	(61.5)	(55.3)
Accounts payable	(0.3)	7.3
Other operating assets	(0.6)	3.2
Other operating liabilities	12.6	(6.0)
Net cash provided by operating activities	38.4	47.5
Investing Activities:
Acquisition of property and equipment	(39.0)	(47.3)
Proceeds from disposal of property and equipment	6.7	21.0
Restricted escrow receipts	95.0	57.1
Restricted escrow deposits	(10.0)	0.0
Proceeds from disposal of equity method investment, net	0.0	14.6
Net cash provided by investing activities	52.7	45.4
Financing Activities:
Repayments of long-term debt	(9.4)	(21.4)
Debt issuance costs	(3.2)	(1.8)
Net cash used in financing activities	(12.6)	(23.2)
Net Increase In Cash and Cash Equivalents	78.5	69.7
Cash and Cash Equivalents, Beginning of Period	136.7	173.8
Cash and Cash Equivalents, End of Period	215.2	243.5
Supplemental Cash Flow Information:
Interest paid	(54.1)	(44.2)
Income tax refund (payment), net	$ 3.0	$ (3.4)