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Supplemental Balance Sheet Information (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Trade Receivables. |  |
Billed trade receivables | $ 128.8 | $ 98.9
Unbilled trade receivables - Note 1 | 2.2 | 0.9
Trade receivables, gross | 131.0 | 99.8
Allowance for doubtful receivables | (0.9) | (0.9)
Trade receivables, net | 130.1 | 98.9
Inventories. |  |
Finished products | 67.5 | 75.9
Work in process | 69.6 | 57.5
Raw materials | 46.2 | 58.1
Operating supplies and repairs and maintenance parts | 14.9 | 14.2
Total | 198.2 | 205.7
Prepaid Expenses and Other Current Assets. |  |
Current derivative assets - Notes 10 and 11 | 1.4 | 0
Current deferred tax assets | 63.0 | 63.0
Current portion of option premiums paid - Notes 10 and 11 | 0.4 | 0.4
Short-term restricted cash | 0.9 | 7.8
Prepaid taxes | 3.7 | 3.8
Prepaid expenses | 5.9 | 3.9
Total | 75.3 | 78.9
Property, Plant and Equipment - Net. |  |
Land and improvements | 22.6 | 22.6
Buildings and leasehold improvements | 49.3 | 45.9
Machinery and equipment | 362.7 | 356.7
Construction in progress | 23.6 | 24.1
Active property, plant and equipment, gross | 458.2 | 449.3
Accumulated depreciation | (92.8) | (86.9)
Active property, plant and equipment, net | 365.4 | 362.4
Idled equipment | 5.4 | 5.4
Total | 370.8 | 367.8
Other Assets. |  |
Derivative assets - Notes 10 and 11 | 37.4 | 46.2
Option premiums paid - Notes 10 and 11 | 0.1 | 0.1
Restricted cash | 10.1 | 10.4
Long-term income tax receivable | 2.9 | 2.8
Deferred financing costs | 7.2 | 7.8
Available for sale securities | 5.1 | 4.9
Other | 0.2 | 0.1
Total | 63.0 | 72.3
Other Accrued Liabilities. |  |
Current derivative liabilities - Notes 10 and 11 | 12.8 | 14.8
Current portion of option premiums received - Notes 10 and 11 | 0.1 | 0.1
Taxes payable | 5.6 | 2.6
Accrued freight | 2.5 | 2.4
Short-term environmental accrual - Note 9 | 1.3 | 1.2
Accrued interest | 4.4 | 2.3
Short-term deferred revenue - Note 1 | 11.3 | 13.5
Other | 4.6 | 4.1
Total | 42.6 | 41.0
Long-term Liabilities. |  |
Derivative liabilities - Notes 10 and 11 | 46.7 | 55.5
Option premiums received - Notes 10 and 11 | 0.1 | 0.1
Income tax liabilities | 13.9 | 13.4
Workers' compensation accruals | 20.5 | 20.8
Long-term environmental accrual - Note 9 | 20.4 | 20.8
Long-term asset retirement obligations | 3.9 | 3.8
Long-term deferred revenue - Note 1 | 2.2 | 3.3
Deferred compensation liability | 5.5 | 5.1
Other long-term liabilities | 2.9 | 3.2
Total | $ 116.1 | $ 126.0

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