Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Operating Activities:
Net Income (Loss)	$ 21.8		$ (109.1)		$ (53.5)
Adjustments to reconcile net income (loss) to cash flows from operating activities:
Depreciation and amortization	143.4		143.6		134.9
Lease amortization and accretion expense	95.7	[1]	133.3	[1]	160.9
Lease payments	(98.8)		(134.4)		(135.0)
Paid-in-kind interest	12.8		9.3		42.4
Debt-related amortization	23.6		22.9		17.5
Equity-based compensation and employee benefits expense	13.5		16.1		21.8
Non-union pension settlement charges	12.1		64.7		3.6
(Gains) losses on property disposals, net	(38.0)		0.7		(45.3)
Deferred income taxes, net	(0.4)		(0.5)		(14.9)
Other non-cash items, net	(1.2)		0.7		0.9
Changes in assets and liabilities, net:
Accounts receivable	64.0		(158.7)		(40.4)
Accounts payable	7.8		16.8		(3.6)
Other operating assets	(15.5)		(28.1)		(23.9)
Other operating liabilities	(119.5)		32.9		57.1
Net cash provided by (used in) operating activities	121.3		10.2		122.5
Investing Activities:
Acquisition of property and equipment	(191.8)		(497.6)		(140.6)
Proceeds from disposal of property and equipment	45.7		3.6		56.1
Net cash provided by (used in) investing activities	(146.1)		(494.0)		(84.5)
Financing Activities:
Issuance of long-term debt, net	0.0		325.2		374.8
Repayment of long-term debt	(48.4)		(3.8)		(31.4)
Debt issuance costs	(1.7)		(0.2)		(12.0)
Payments for tax withheld on equity-based compensation	(0.9)		(0.6)		(0.6)
Net cash provided by (used in) financing activities	(51.0)		320.6		330.8
Net Increase (Decrease) In Cash and Cash Equivalents and Restricted Amounts Held in Escrow	(75.8)		(163.2)		368.8
Cash and Cash Equivalents and Restricted Amounts Held in Escrow, Beginning of Period	314.8		478.0		109.2
Cash and Cash Equivalents and Restricted Amounts Held in Escrow, End of Period	239.0		314.8		478.0
Supplemental Cash Flow Information:
Interest paid	$ (127.4)		$ (116.8)		$ (67.6)

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