Statements of Consolidated Cash Flows (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Operating Activities:
Net loss		$ (54.6)	$ (27.5)
Adjustments to reconcile net loss to cash flows from operating activities:
Depreciation and amortization		35.3	35.7
Lease amortization and accretion expense	[1]	19.8	27.2
Lease payments		(19.4)	(28.6)
Paid-in-kind interest		5.4	2.3
Debt-related amortization		5.7	5.9
Equity-based compensation and employee benefits expense		4.1	4.3
Non-union pension settlement charges		0.1	0.0
Gains on property disposals, net		(0.5)	(5.5)
Deferred income taxes, net		0.0	0.0
Other non-cash items, net		(0.1)	0.2
Changes in assets and liabilities, net:
Accounts receivable		0.5	(77.5)
Accounts payable		(11.0)	36.1
Other operating assets		15.4	9.3
Other operating liabilities		11.9	(15.4)
Net cash provided by (used in) operating activities		12.6	(33.5)
Investing Activities:
Acquisition of property and equipment		(29.6)	(36.4)
Proceeds from disposal of property and equipment		2.4	6.6
Net cash provided by (used in) investing activities		(27.2)	(29.8)
Financing Activities:
Repayment of long-term debt		(69.5)	(8.9)
Payments for tax withheld on equity-based compensation		(0.2)	(0.5)
Net cash provided by (used in) financing activities		(69.7)	(9.4)
Net Increase (Decrease) In Cash and Cash Equivalents and Restricted Amounts Held in Escrow		(84.3)	(72.7)
Cash and Cash Equivalents and Restricted Amounts Held in Escrow, Beginning of Period		239.0	314.8
Cash and Cash Equivalents and Restricted Amounts Held in Escrow, End of Period		154.7	242.1
Supplemental Cash Flow Information:
Interest paid		$ (38.0)	$ (30.9)

[1] Operating lease cost represents non-cash amortization of ROU assets and accretion of the discounted lease liabilities and is segregated on the statements of consolidated cash flows.