CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Activities
Net income (loss)	$ 327.9	$ 549.5	$ (3.9)
Adjustments to reconcile net income (loss) to net cash and cash equivalents provided by (used for) operating activities:
Losses (earnings) of non-consolidated affiliates	19.7	(1.8)	(1.7)
Losses (gains) on disposition of property, plant and equipment	2.0	(3.1)	0.7
Stock-based compensation	12.0	9.1	7.5
Depreciation and amortization	601.4	558.9	533.5
Deferred income taxes	35.6	(452.7)	(32.7)
Write-off of equipment and facility included in restructuring charges	2.6	1.4	76.6
Qualified pension plan contributions	(2.6)	(1.7)	(7.3)
Qualified pension plan income	(15.0)	(26.9)	(37.5)
Change in assets and liabilities:
Receivables	(46.3)	(49.9)	38.5
Income taxes receivable/payable	24.5	9.6	10.7
Inventories	(35.5)	(37.8)	23.9
Other current assets	0.2	(12.1)	20.9
Accounts payable and accrued liabilities	(14.5)	100.0	(13.1)
Other assets	(2.6)	5.8	(4.3)
Other noncurrent liabilities	4.3	(5.9)	(12.1)
Other operating activities	(5.9)	6.4	3.5
Net operating activities	907.8	648.8	603.2
Investing Activities
Capital expenditures	(385.2)	(294.3)	(278.0)
Business acquired and related transactions, net of cash acquired	0.0	0.0	(69.5)
Payments under long-term supply contracts	0.0	(209.4)	(175.7)
Proceeds from sale/leaseback of equipment	0.0		40.4
Proceeds from disposition of property, plant and equipment	2.9	5.2	0.5
Proceeds from disposition of affiliated companies	0.0	0.0	8.8
Net investing activities	(382.3)	(498.5)	(473.5)
Long-term debt:
Borrowings	570.0	2,035.5	230.0
Repayments	946.1	2,037.9	435.3
Common stock repurchased and retired	(50.0)	0.0	0.0
Stock options exercised	3.4	29.8	0.5
Excess tax benefits from stock-based compensation	0.0	0.0	0.4
Dividends paid	(133.6)	(133.0)	(132.1)
Debt issuance costs	(8.5)	(11.2)	(1.0)
Net financing activities	(564.8)	(116.8)	(337.5)
Effect of exchange rate changes on cash and cash equivalents	(0.3)	0.4	0.3
Net (decrease) increase in cash and cash equivalents	(39.6)	33.9	(207.5)
Cash and cash equivalents, beginning of year	218.4	184.5	392.0
Cash and cash equivalents, end of year	178.8	218.4	184.5
Cash paid for interest and income taxes:
Interest, net	208.8	200.9	200.8
Income taxes, net of refunds	$ 52.9	$ 18.0	$ (2.6)