Statements of Consolidated Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities:
Net loss	$ (14.6)	$ (25.3)
Noncash items included in net loss:
Depreciation and amortization	37.7	37.1
Noncash equity-based compensation and employee benefits expense	5.3	5.3
Losses on property disposals, net	3.2	2.7
Other noncash items, net	0.4	2.9
Changes in assets and liabilities, net:
Accounts receivable	(41.3)	(45.0)
Accounts payable	1.9	(9.2)
Other operating assets	(29.4)	(8.0)
Other operating liabilities	33.1	15.9
Net cash used in operating activities	(3.7)	(23.6)
Investing Activities:
Acquisition of property and equipment	(23.5)	(16.3)
Proceeds from disposal of property and equipment	3.0	1.5
Net cash used in investing activities	(20.5)	(14.8)
Financing Activities:
Repayments of long-term debt	(7.0)	(5.4)
Debt issuance costs	0.0	(3.2)
Payments for tax withheld on equity-based compensation	(1.4)	(2.3)
Net cash used in financing activities	(8.4)	(10.9)
Net Decrease In Cash, Cash Equivalents and Restricted Amounts Held in Escrow	(32.6)	(49.3)
Cash, Cash Equivalents and Restricted Amounts Held in Escrow, Beginning of Period	145.7	275.7
Cash, Cash Equivalents and Restricted Amounts Held in Escrow, End of Period	113.1	226.4
Supplemental Cash Flow Information:
Interest paid	(14.9)	(30.4)
Income tax refund (payment), net	$ (1.7)	$ 4.4