Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating activities
Net income	$ 34.8	$ 192.4	$ 218.9
Adjustments to reconcile net income to net cash (used in) operating activities
Depreciation expense	151.1	129.2	115.3
Amortization expense	5.1	4.9	4.7
Amortization of deferred financing fees	14.6	5.6	8.0
Accretion Of Customer Supply Agreement	0.2
Bad debt expense		1.4
Employee stock compensation expense	15.3	11.2	28.8
Excess tax benefit of share-based payment arrangements	(1.2)	(1.3)	(5.0)
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	5.2
Loss from foreign currency transactions	(5.6)	1.0	4.8
Loss on disposition of assets	14.1	1.0	0.7
Deferred taxes	(120.1)	21.6	48.5
Long-term tax(benefit) provision	3.6	(6.1)	(9.7)
Pension and other post retirement benefits, net	(8.9)	(9.6)	(8.9)
Grant Income	5.8	5.4	3.1
Equity in net loss of affiliates	0.7	1.0	0.7
(Gain) from ineffectiveness of hedge contracts	(1.5)
Changes in assets and liabilities
Accounts receivable	(151.1)	(66.3)	(41.6)
Inventory, net	228.3	(121.6)	(300.3)
Accounts payable and accrued liabilities	109.8	106.1	0.8
Profit sharing/deferred compensation	4.7	(5.5)	26.1
Advance payments	239.6	(159.9)	(140.3)
Income taxes receivable/payable	(4.3)	65.0	4.3
Deferred revenue and other deferred credits	(12.4)	(265.9)	181.8
Other	28.2	53.9	(9.4)
Net cash (used in) operating activities	544.4	(47.3)	125.1
Investing Activities
Purchase of property, plant and equipment	(236.1)	(249.7)	(288.1)
Purchase Of Property Plant And Equipment Severe Weather Event	(12.9)
Proceeds from sale of assets	1.6	0.5	0.5
Other Investing Activities	(1.4)		(0.8)
Net cash (used in) investing activities	(248.8)	(249.2)	(288.4)
Financing Activities
Proceeds from revolving credit facility	170.0	30.0	150.0
Repayments on revolving credit facility	170.0	30.0	150.0
Proceeds from issuance of debt	547.6
Proceeds from issuance of bonds			300.0
Principal payments of debt	(571.0)	(8.0)	(9.6)
Excess tax benefit of share-based payment arrangements	1.2	1.3	5.0
Debt issuance and financing costs	(12.4)		(18.0)
Net cash provided by (used in) financing activities	(34.6)	(6.7)	277.4
Effect of exchange rate changes on cash and cash equivalents	1.9	(0.6)	(1.5)
Net (decrease) in cash and cash equivalents for the period	262.9	(303.8)	112.6
Cash and cash equivalents, beginning of period	177.8		369.0
Cash and cash equivalents, end of period	440.7	177.8		369.0
Supplemental information
Interest Paid		83.7	60.7	69.7
Income Taxes Paid		5.6	34.9	96.7
Property acquired through capital leases		0.1	10.7	2.6
Property Acquired Through Governmental Grants			8.9
Financing Obligations		$ 12.5