Statements of Consolidated Cash Flows (Unaudited) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021
Operating Activities:
Net income (loss)		$ 37.3	$ (64.4)
Adjustments to reconcile net income (loss) to cash flows from operating activities:
Depreciation and amortization		107.2	106.1
Lease amortization and accretion expense	[1]	75.2	103.4
Lease payments		(77.4)	(105.6)
Paid-in-kind interest		8.2	7.0
Debt-related amortization		17.4	17.2
Equity-based compensation and employee benefits expense		10.5	12.3
Non-union pension settlement charge		4.0	3.4
(Gains) losses on property disposals, net		(9.8)	1.5
Deferred income taxes, net		0.0	(1.0)
Other non-cash items, net		(1.5)	0.6
Changes in assets and liabilities, net:
Accounts receivable		(42.9)	(135.7)
Accounts payable		18.4	28.4
Other operating assets		1.7	(19.8)
Other operating liabilities		(27.0)	55.9
Net cash provided by (used in) operating activities		121.3	9.3
Investing Activities:
Acquisition of property and equipment		(140.7)	(442.9)
Proceeds from disposal of property and equipment		13.3	1.1
Net cash provided by (used in) investing activities		(127.4)	(441.8)
Financing Activities:
Issuance of long-term debt, net		0.0	325.2
Repayment of long-term debt		(15.7)	(1.8)
Debt issuance costs		0.0	(0.2)
Payments for tax withheld on equity-based compensation		(0.8)	(0.5)
Net cash provided by (used in) financing activities		(16.5)	322.7
Net Increase (Decrease) In Cash and Cash Equivalents and Restricted Amounts Held in Escrow		(22.6)	(109.8)
Cash and Cash Equivalents and Restricted Amounts Held in Escrow, Beginning of Period		314.8	478.0
Cash and Cash Equivalents and Restricted Amounts Held in Escrow, End of Period		292.2	368.2
Supplemental Cash Flow Information:
Interest paid		$ (102.8)	$ (86.2)

[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.