CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net (loss) income	$ (11.3)	$ 327.9	$ 549.5
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	(11.2)	0.0	0.0
Losses (earnings) of non-consolidated affiliates	0.0	19.7	(1.8)
Losses (gains) on disposition of property, plant and equipment	0.0	2.0	(3.1)
Stock-based compensation	10.7	12.0	9.1
Depreciation and amortization	597.4	601.4	558.9
Deferred income taxes	(45.5)	35.6	(452.7)
Write-off of equipment and facility included in restructuring charges	58.9	2.6	1.4
Qualified pension plan contributions	(14.9)	(2.6)	(1.7)
Qualified pension plan income	(9.3)	(15.0)	(26.9)
Change in assets and liabilities:
Receivables	12.3	(46.3)	(49.9)
Income taxes receivable/payable	(10.7)	24.5	9.6
Inventories	13.0	(35.5)	(37.8)
Other current assets	7.4	0.2	(12.1)
Accounts payable and accrued liabilities	(11.0)	(14.5)	100.0
Other assets	(1.3)	(2.6)	5.8
Other noncurrent liabilities	30.5	4.3	(5.9)
Other operating activities	2.3	(5.9)	6.4
Net operating activities	617.3	907.8	648.8
Investing Activities
Capital expenditures	(385.6)	(385.2)	(294.3)
Payments under long-term supply contracts	0.0	0.0	(209.4)
Proceeds from disposition of property, plant and equipment	0.0	2.9	5.2
Proceeds from disposition of affiliated companies	20.0	0.0	0.0
Net investing activities	(365.6)	(382.3)	(498.5)
Long-term debt:
Borrowings	825.0	570.0	2,035.5
Repayments	744.2	946.1	2,037.9
Common stock repurchased and retired	(145.9)	(50.0)	0.0
Stock options exercised	1.7	3.4	29.8
Dividends paid	(129.3)	(133.6)	(133.0)
Debt issuance costs	(16.6)	(8.5)	(11.2)
Net financing activities	(209.3)	(564.8)	(116.8)
Effect of exchange rate changes on cash and cash equivalents	(0.3)	(0.3)	0.4
Net increase (decrease) in cash and cash equivalents	42.1	(39.6)	33.9
Cash and cash equivalents, beginning of year	178.8	218.4	184.5
Cash and cash equivalents, end of year	220.9	178.8	218.4
Cash paid for interest and income taxes:
Interest, net	198.3	208.8	200.9
Income taxes, net of refunds	$ 36.3	$ 52.9	$ 18.0