Statements of Consolidated Cash Flows (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Operating Activities:
Net loss		$ (27.5)	$ (63.3)
Adjustments to reconcile net loss to cash flows from operating activities:
Depreciation and amortization		35.7	33.3
Lease amortization and accretion expense	[1]	27.2	36.9
Lease payments		(28.6)	(37.7)
Paid-in-kind interest		2.3	2.3
Debt-related amortization		5.9	5.7
Equity-based compensation and employee benefits expense		4.3	5.1
(Gains) losses on property disposals, net		(5.5)	1.0
Deferred income taxes, net		0.0	(1.0)
Other non-cash items, net		0.2	0.7
Changes in assets and liabilities, net:
Accounts receivable		(77.5)	(74.9)
Accounts payable		36.1	36.1
Other operating assets		9.3	(4.0)
Other operating liabilities		(15.4)	21.0
Net cash provided by (used in) operating activities		(33.5)	(38.8)
Investing Activities:
Acquisition of property and equipment		(36.4)	(202.4)
Proceeds from disposal of property and equipment		6.6	0.4
Net cash provided by (used in) investing activities		(29.8)	(202.0)
Financing Activities:
Issuance of long-term debt, net		0.0	176.5
Repayment of long-term debt		(8.9)	(0.5)
Debt issuance costs		0.0	(0.1)
Payments for tax withheld on equity-based compensation		(0.5)	(0.3)
Net cash provided by (used in) financing activities		(9.4)	175.6
Net Increase (Decrease) In Cash and Cash Equivalents and Restricted Amounts Held in Escrow		(72.7)	(65.2)
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		242.1	412.8
Supplemental Cash Flow Information:
Interest paid		$ (30.9)	$ (27.3)

[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.