Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities
Net (loss) income	$ (621.4)	$ 34.8	$ 192.4
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities
Depreciation expense	158.2	151.1	129.2
Amortization expense	3.1	5.1	4.9
Amortization of deferred financing fees	6.7	14.6	5.6
Accretion of customer supply agreement	0.6	0.2	0
Bad debt expense	0	0	1.4
Employee stock compensation expense	19.6	15.3	11.2
Excess tax benefit of share-based payment arrangements	(0.6)	(1.2)	(1.3)
Loss from discontinued hedge accounting on interest rate swaps	0	5.2	0
(Gain) from the ineffectiveness of hedge contracts	(2.6)	(1.5)	0
(Gain) loss from foreign currency transactions	(2.6)	(5.6)	1.0
Loss on disposition of assets	0.1	14.1	1.0
Deferred taxes	202.8	(120.1)	21.6
Long-term tax benefit	(2.5)	3.6	(6.1)
Pension and other post retirement benefits, net	(32.0)	(8.9)	(9.6)
Grant income	(7.3)	(5.8)	(5.4)
Equity in net loss of affiliates	(0.5)	0.7	1.0
Changes in assets and liabilities
Accounts receivable	(128.5)	(151.1)	(66.3)
Inventory, net	666.0	228.3	(121.6)
Accounts payable and accrued liabilities	94.2	109.8	106.1
Profit sharing/deferred compensation	10.0	4.7	(5.5)
Advance payments	(41.9)	239.6	(159.9)
Income taxes receivable/payable	(82.2)	(4.3)	65.0
Deferred revenue and other deferred credits	(0.2)	(12.4)	(265.9)
Other	21.6	28.2	53.9
Net cash provided by (used in) operating activities	260.6	544.4	(47.3)
Investing activities
Purchase of property, plant and equipment	(234.2)	(236.1)	(249.7)
Purchase of property, plant and equipment — severe weather event (see Note 4)	(38.4)	(12.9)	0
Proceeds from sale of assets	0.7	1.6	0.5
Other	3.7	(1.4)	0
Net cash (used in) investing activities	(268.2)	(248.8)	(249.2)
Financing activities
Proceeds from revolving credit facility	0	170.0	30.0
Payments on revolving credit facility	0	(170.0)	(30.0)
Proceeds from issuance of debt	0	547.6	0
Principal payments of debt	(10.4)	(571.0)	(8.0)
Excess tax benefit of share-based payment arrangements	0.6	1.2	1.3
Debt issuance and financing costs	(4.1)	(12.4)	0
Net cash (used in) financing activities	(13.9)	(34.6)	(6.7)
Effect of exchange rate changes on cash and cash equivalents	1.5	1.9	(0.6)
Net (decrease) increase in cash and cash equivalents for the period	(20.0)	262.9	(303.8)
Cash and cash equivalents, beginning of period	440.7	177.8	481.6
Cash and cash equivalents, end of period	420.7	440.7	177.8
Supplemental information
Interest paid	68.0	69.7	83.7
Income taxes paid	69.4	96.7	5.6
Property acquired through capital leases	0.4	2.6	0.1
Financing obligations	$ 0	$ 0	$ 12.5