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)	$ 1,326.9	$ 1,296.7	$ (969.9)
Adjustments to reconcile net income (loss) to net cash and cash equivalents provided by (used for) operating activities:
Goodwill impairment	0.0	0.0	699.8
Gains on disposition of property, plant and equipment	(13.0)	(1.4)	0.0
Stock-based compensation	14.1	8.3	13.6
Loss on Extinguishment of Debt	0.0	152.2	20.4
Depreciation and amortization	598.8	582.5	568.4
Deferred income taxes	(32.4)	(42.7)	(18.4)
Qualified pension plan contributions	(1.3)	(1.1)	(2.1)
Qualified pension plan income	33.1	27.8	11.4
Change in assets and liabilities:
Receivables	160.8	(360.0)	(0.3)
Income taxes receivable/payable	(2.9)	105.1	(11.2)
Inventories	(86.3)	(206.0)	28.6
Other current assets	15.9	(22.3)	(24.8)
Accounts payable and accrued liabilities	(22.3)	240.1	149.3
Other assets	(2.6)	(13.3)	(20.2)
Other noncurrent liabilities	(0.7)	26.2	8.6
Other operating activities	0.0	4.5	2.6
Net operating activities	1,921.9	1,741.0	433.0
Investing Activities
Capital expenditures	(236.9)	(200.6)	(298.9)
Payments under ethylene long-term supply contracts	0.0	0.0	461.0
Payments under other long-term supply contracts	(37.7)	0.0	(75.8)
Proceeds from disposition of property, plant and equipment	14.9	3.2	0.0
Net investing activities	(259.7)	(197.4)	(835.7)
Long-term debt:
Borrowings	415.0	540.0	1,827.5
Repayments	616.1	1,643.1	1,307.2
Debt early redemption premiums	0.0	(137.7)	(14.6)
Common stock repurchased and retired	(1,350.7)	(251.9)	0.0
Stock options exercised	25.7	72.4	1.9
Dividends paid	(116.2)	(127.8)	(126.3)
Debt issuance costs	(4.4)	(3.9)	(10.3)
Net financing activities	(1,646.7)	(1,552.0)	371.0
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations	(2.0)	(0.8)	0.5
Net increase (decrease) in cash and cash equivalents	13.5	(9.2)	(31.2)
Cash and cash equivalents, beginning of year	180.5	189.7	220.9
Cash and cash equivalents, end of year	194.0	180.5	189.7
Cash paid (received) for interest and income taxes:
Interest, net	141.7	345.2	286.4
Income taxes, net of refunds	$ 356.6	$ 169.6	$ (9.6)