Condensed Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating Activities
Net (loss) income	$ (200.1)	$ 21.7
Adjustments to reconcile net (loss) income to net cash and cash equivalents provided by (used for) operating activities:
Gain on disposition of non-consolidated affiliate	0.0	(11.2)
Stock-based compensation	4.1	5.3
Depreciation and amortization	283.0	304.3
Deferred income taxes	(52.1)	(16.6)
Qualified pension plan contributions	(1.2)	(0.7)
Qualified pension plan income	(5.9)	(4.6)
Change in:
Receivables	64.1	(70.8)
Income taxes receivable/payable	(15.8)	(30.6)
Inventories	75.7	9.6
Other current assets	(18.3)	2.4
Accounts payable and accrued liabilities	(74.9)	(1.9)
Other assets	0.6	(2.3)
Other noncurrent liabilities	(5.6)	29.4
Other operating activities	1.8	2.1
Net operating activities	55.4	236.1
Investing Activities
Capital expenditures	(166.5)	(191.3)
Payments under ethylene long-term supply contracts	(461.0)	0.0
Payments under other long-term supply contracts	(75.8)	0.0
Proceeds from disposition of non-consolidated affiliate	0.0	20.0
Net investing activities	(703.3)	(171.3)
Long-term debt:
Borrowings	1,163.2	25.0
Repayments	(425.8)	(50.6)
Common stock repurchased and retired	0.0	(26.7)
Stock options exercised	0.5	1.5
Dividends paid	(63.1)	(65.7)
Debt issuance costs	(9.6)	0.0
Net financing activities	665.2	(116.5)
Effect of exchange rate changes on cash and cash equivalents	(0.3)	(0.2)
Net increase (decrease) in cash and cash equivalents	17.0	(51.9)
Cash and cash equivalents, beginning of year	220.9	178.8
Cash and cash equivalents, end of period	237.9	126.9
Cash paid for interest and income taxes:
Interest, net	122.3	108.2
Income taxes, net of refunds	3.1	44.3
Non-cash investing activities:
Decrease in capital expenditures included in accounts payable and accrued liabilities	$ 38.6	$ 10.1