CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income	$ 770.5	$ 14.4	$ 36.4
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	210.3	230.6	206.2
Deferred income taxes	54.9	5.3	4.3
Provision for doubtful accounts	11.2	16.8	16.9
Gain on sale of markets	(1,001.3)
(Gain) loss on sale of assets, net	(0.5)		5.4
Amortization of debt issuance costs and discount	4.7	4.7	4.7
Loss on debt extinguishment	3.2
Impairment losses on intangibles and goodwill		14.0	9.7
Non-cash compensation	15.3	11.1	10.1
Other non-cash items	(0.2)	(0.2)	0.6
Changes in operating assets and liabilities:
Receivables and other operating assets	(27.9)	(28.1)	(25.2)
Payables and accruals	133.8	8.8	(2.8)
Net cash provided by operating activities	174.0	277.4	266.3
Cash flows from investing activities:
Capital expenditures	(207.7)	(234.1)	(247.5)
Proceeds from sale of markets, net	1,765.7		24.7
Other investing activities	1.3	(0.2)	(1.3)
Net cash provided by (used in) investing activities	1,559.3	(234.3)	(224.1)
Cash flows from financing activities:
Proceeds from issuance of long-term debt, net	762.1	91.0	80.0
Payments on long-term debt and finance lease obligations	(2,303.5)	(141.7)	(112.8)
Payments of debt issuance costs	(2.6)
Purchase of shares	(8.5)	(1.0)	(1.6)
Net cash used in by financing activities	(1,552.5)	(51.7)	(34.4)
Increase (decrease) in cash and cash equivalents	180.8	(8.6)	7.8
Cash and cash equivalents, beginning of period	12.4	21.0	13.2
Cash and cash equivalents, end of period	193.2	12.4	21.0
Supplemental disclosures of cash flow information:
Cash paid during the periods for interest	93.1	124.0	139.0
Cash paid during the periods for income taxes	97.1	1.5	1.6
Cash received during the periods for refunds of income taxes		4.6	4.4
Insurance proceeds received for business interruption			9.6
Non-cash financing activities:
Other financing arrangements		1.1
Capital expenditure accounts payable and accruals	$ 27.4	$ 19.1	$ 16.8