Statements of Consolidated Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities:
Net loss	$ (49.1)	$ (14.6)
Noncash items included in net loss:
Depreciation and amortization	40.0	37.7
Lease amortization and accretion expense	41.2	0.0
Equity-based compensation and employee benefits expense	5.3	5.3
Losses on property disposals, net	1.6	3.2
Impairment charges	8.2	0.0
Other noncash items, net	0.8	0.4
Changes in assets and liabilities, net:
Accounts receivable	(42.1)	(41.3)
Accounts payable	12.8	1.9
Other operating assets	(20.0)	(29.4)
Other operating liabilities	(40.4)	33.1
Net cash used in operating activities	(41.7)	(3.7)
Investing Activities:
Acquisition of property and equipment	(32.6)	(23.5)
Proceeds from disposal of property and equipment	0.8	3.0
Net cash used in investing activities	(31.8)	(20.5)
Financing Activities:
Repayments of long-term debt	(1.9)	(7.0)
Payments for tax withheld on equity-based compensation	(0.6)	(1.4)
Net cash used in financing activities	(2.5)	(8.4)
Net Decrease In Cash, Cash Equivalents and Restricted Amounts Held in Escrow	(76.0)	(32.6)
Cash, Cash Equivalents and Restricted Amounts Held in Escrow, Beginning of Period	227.6	145.7
Cash, Cash Equivalents and Restricted Amounts Held in Escrow, End of Period	151.6	113.1
Supplemental Cash Flow Information:
Interest paid	(13.3)	(14.9)
Income tax payment, net	$ (1.6)	$ (1.7)