Statements of Consolidated Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating Activities:
Net loss	$ (64.4)	$ (34.8)
Adjustments to reconcile net loss to cash flows from operating activities:
Depreciation and amortization	106.1	102.4
Lease amortization and accretion expense	103.4	122.7
Lease payments	(105.6)	(94.6)
Paid-in-kind interest	7.0	40.5
Debt-related amortization	17.2	11.8
Equity-based compensation and employee benefits expense	12.3	14.4
Non-union pension settlement charge	3.4	1.9
(Gains) losses on property disposals, net	1.5	(45.3)
Deferred income taxes, net	(1.0)	(11.1)
Other non-cash items, net	0.6	(0.2)
Changes in assets and liabilities, net:
Accounts receivable	(135.7)	(76.9)
Accounts payable	28.4	24.8
Other operating assets	(19.8)	(9.3)
Other operating liabilities	55.9	62.2
Net cash provided by (used in) operating activities	9.3	108.5
Investing Activities:
Acquisition of property and equipment	(442.9)	(41.4)
Proceeds from disposal of property and equipment	1.1	55.3
Net cash provided by (used in) investing activities	(441.8)	13.9
Financing Activities:
Issuance of long-term debt, net	325.2	245.0
Repayment of long-term debt	(1.8)	(29.1)
Debt issuance costs	(0.2)	(8.4)
Payments for tax withheld on equity-based compensation	(0.5)	(0.6)
Net cash provided by (used in) financing activities	322.7	206.9
Net Increase (Decrease) In Cash and Cash Equivalents and Restricted Amounts Held in Escrow	(109.8)	329.3
Cash and Cash Equivalents and Restricted Amounts Held in Escrow, Beginning of Period	478.0	109.2
Cash and Cash Equivalents and Restricted Amounts Held in Escrow, End of Period	368.2	438.5
Supplemental Cash Flow Information:
Interest paid	$ (86.2)	$ (47.2)