CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net (loss) income	$ (2.5)	$ 770.5	$ 14.4
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	179.3	210.3	230.6
Deferred income taxes	(32.2)	54.9	5.3
Provision for doubtful accounts	6.0	11.2	16.8
Gain on sale of markets		(1,001.3)
Gain on sale of operating assets, net	(1.1)	(0.5)
Amortization of debt issuance costs and discount	1.7	4.7	4.7
Loss on debt extinguishment		3.2
Impairment losses on intangibles	35.0		14.0
Non-cash compensation	25.8	15.3	11.1
Other non-cash items	(0.1)	(0.2)	(0.2)
Changes in operating assets and liabilities:
Receivables and other operating assets	(14.3)	(27.9)	(28.1)
Payables and accruals	(163.8)	133.8	8.8
Net cash (used in) provided by operating activities	33.8	174.0	277.4
Cash flows from investing activities:
Capital expenditures	(167.2)	(207.7)	(234.1)
Proceeds from sale of markets, net		1,765.7
Other investing activities	1.4	1.3	(0.2)
Net cash (used in) provided by investing activities	(165.8)	1,559.3	(234.3)
Cash flows from financing activities:
Proceeds from issuance of long-term debt, net	9.0	762.1	91.0
Payments on long-term debt and finance lease obligations	(19.8)	(2,303.5)	(141.7)
Payments of debt issuance costs		(2.6)
Purchase of shares	(19.4)	(8.5)	(1.0)
Net cash used in financing activities	(30.2)	(1,552.5)	(51.7)
(Decrease) increase in cash and cash equivalents	(162.2)	180.8	(8.6)
Cash and cash equivalents, beginning of period	193.2	12.4	21.0
Cash and cash equivalents, end of period	31.0	193.2	12.4
Supplemental disclosures of cash flow information:
Cash paid during the periods for interest	37.8	93.1	124.0
Cash paid during the periods for income taxes	147.5	97.1	1.5
Cash received during the periods for refunds of income taxes	1.7		4.6
Non-cash financing activities:
Other financing arrangements			1.1
Capital expenditure accounts payable and accruals	$ 32.0	$ 27.4	$ 19.1