CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities
Net income (loss)	$ 549.5	$ (3.9)	$ (1.4)
Adjustments to reconcile net income to net cash and cash equivalents provided by (used for) operating activities:
Earnings of non-consolidated affiliates	(1.8)	(1.7)	(1.7)
Losses (gains) on disposition of property, plant and equipment	(3.1)	0.7	(25.2)
Stock-based compensation	9.1	7.5	7.6
Depreciation and amortization	558.9	533.5	228.9
Deferred income taxes	(452.7)	(32.7)	5.6
Write-off of equipment and facility included in restructuring charges	1.4	76.6	0.5
Qualified pension plan contributions	(1.7)	(7.3)	(0.9)
Qualified pension plan income	(26.9)	(37.5)	(32.0)
Change in assets and liabilities:
Receivables	(49.9)	38.5	(115.1)
Income taxes receivable/payable	9.6	10.7	(12.6)
Inventories	(37.8)	23.9	(1.7)
Other current assets	(12.1)	20.9	(30.6)
Accounts payable and accrued liabilities	100.0	(13.1)	185.1
Other assets	5.8	(4.3)	37.6
Other noncurrent liabilities	(5.9)	(12.1)	(32.5)
Other operating activities	6.4	3.5	5.5
Net operating activities	648.8	603.2	217.1
Investing Activities
Capital expenditures	(294.3)	(278.0)	(130.9)
Business acquired and related transactions, net of cash acquired	0.0	(69.5)	(408.1)
Payments under long-term supply contracts	(209.4)	(175.7)	0.0
Proceeds from sale/leaseback of equipment	0.0	40.4	0.0
Proceeds from disposition of property, plant and equipment	5.2	0.5	26.2
Proceeds from disposition of affiliated companies	0.0	8.8	8.8
Net investing activities	(498.5)	(473.5)	(504.0)
Long-term debt:
Borrowings	2,035.5	230.0	1,275.0
Repayments	2,037.9	435.3	730.7
Stock options exercised	29.8	0.5	2.2
Excess tax benefits from stock-based compensation	0.0	0.4	0.4
Dividends paid	(133.0)	(132.1)	(79.5)
Debt and equity issuance costs	(11.2)	(1.0)	(45.2)
Net financing activities	(116.8)	(337.5)	422.2
Effect of exchange rate changes on cash and cash equivalents	0.4	0.3	(0.1)
Net increase (decrease) in cash and cash equivalents	33.9	(207.5)	135.2
Cash and cash equivalents, beginning of year	184.5	392.0	256.8
Cash and cash equivalents, end of year	218.4	184.5	392.0
Cash paid for interest and income taxes:
Interest, net	200.9	200.8	32.3
Income taxes, net of refunds	$ 18.0	$ (2.6)	$ 5.3