Statements of Consolidated Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating Activities:
Net loss	$ (32.8)	$ (72.7)
Adjustments to reconcile net loss to cash flows from operating activities:
Depreciation and amortization	69.9	78.5
Lease amortization and accretion expense	83.5	82.3
Lease payments	(55.7)	(75.4)
Paid-in-kind interest	38.8	0.0
Equity-based compensation and employee benefits expense	10.5	9.5
Gains losses on property disposals, net	(45.3)	(4.6)
Impairment charges	0.0	8.2
Deferred income tax benefit, net	0.1	(1.6)
Other noncash items, net	4.8	2.1
Changes in assets and liabilities, net:
Accounts receivable	(31.9)	(67.2)
Accounts payable	22.0	5.3
Other operating assets	8.6	(4.5)
Other operating liabilities	141.1	10.6
Net cash provided by (used in) operating activities	213.6	(29.5)
Investing Activities:
Acquisition of property and equipment	(24.1)	(70.6)
Proceeds from disposal of property and equipment	54.1	8.3
Net cash provided by (used in) investing activities	30.0	(62.3)
Financing Activities:
Repayment of long-term debt	(28.2)	(17.5)
Debt issuance costs	(3.8)	0.0
Payments for tax withheld on equity-based compensation	(0.6)	(0.8)
Net cash used in financing activities	(32.6)	(18.3)
Net Increase (Decrease) In Cash and Cash Equivalents and Restricted Amounts Held in Escrow	211.0	(110.1)
Cash and Cash Equivalents and Restricted Amounts Held in Escrow, Beginning of Period	109.2	227.6
Cash and Cash Equivalents and Restricted Amounts Held in Escrow, End of Period	320.2	117.5
Supplemental Cash Flow Information:
Interest paid	(22.1)	(50.6)
Income tax payment	$ (0.6)	$ (2.5)