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 (loss)	$ 249.1	$ (82.1)	$ 137.2
Net loss from discontinued operations	0.0	(95.4)	(2.4)
Income from continuing operations, net of tax	249.1	13.3	139.6
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	103.2	92.9	96.4
Equity in income of unconsolidated affiliates	(143.2)	(27.7)	(50.6)
Distributions from unconsolidated affiliates	109.4	30.7	38.1
Stock-based compensation	27.8	23.7	23.8
Deferred income taxes	9.8	30.1	31.5
Asset impairments	15.3	17.5	0.0
Amortization of operating lease assets	5.3	5.0	4.6
Other	5.3	4.5	2.8
Changes in operating assets and liabilities, net of businesses acquired and dispositions:
Income taxes	12.9	(34.6)	3.6
Deferred revenue	10.7	(8.3)	(9.3)
Other assets and liabilities	53.9	(3.9)	12.0
Net cash provided by operating activities	459.5	143.2	292.5
Cash flows from investing activities:
Capital maintenance expenditures	(39.5)	(23.0)	(48.3)
Capital project expenditures	(52.3)	(211.2)	(82.9)
Acquisition of businesses, net of cash acquired	0.0	0.0	(206.6)
Investments in and advances to unconsolidated affiliates	0.0	0.0	(410.1)
Acquisition of other intangible assets	0.0	0.0	(32.1)
Other	(8.6)	(5.2)	(1.2)
Net cash used in investing activities	(100.4)	(239.4)	(781.2)
Cash flows from financing activities:
Proceeds from borrowings under long-term debt obligations	780.8	726.1	1,236.3
Repayments of borrowings under long-term debt obligations	(430.9)	(580.4)	(640.3)
Payment of dividends	(24.8)	(23.4)	(22.2)
Repurchase of common stock	(297.5)	(28.4)	(95.0)
Cash settlement of stock awards	0.0	(12.7)	0.0
Taxes paid related to net share settlement of stock awards	(12.9)	(18.7)	(11.5)
Debt issuance costs	(6.9)	(2.0)	(8.9)
Change in bank overdraft	(10.5)	13.4	0.0
Other	2.2	2.1	2.4
Net cash (used in) provided by financing activities	(0.5)	76.0	460.8
Cash flows from discontinued operations:
Operating activities of discontinued operations	(124.0)	(1.3)	(2.9)
Net increase (decrease) in cash, cash equivalents and restricted cash	234.6	(21.5)	(30.8)
Cash, cash equivalents and restricted cash, beginning of year	121.0	142.5	173.3
Cash, cash equivalents and restricted cash, end of year	355.6	121.0	142.5
Supplemental disclosures of cash flow information:
Interest	77.5	79.6	61.7
Income taxes	72.4	1.6	23.5
Schedule of non-cash investing and financing activities:
Dividends payable	27.0	25.8	23.5
Deferred tax liability assumed from equity investment	0.0	0.0	103.2
Property and equipment additions included in accounts payable and accrued expense and other current liabilities	18.7	12.9	12.4
Repurchase of common stock in payment of income taxes on stock-based compensation included in accrued expense and other current liabilities	3.2	0.0	3.9
Repurchase of common stock included in accrued expense and other current liabilities	$ 0.0	$ 0.0	$ 0.5