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Supplemental Balance Sheet Information (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Trade Receivables. |  |
Billed trade receivables | $ 128.1 | $ 98.9
Unbilled trade receivables - Note 1 | 4.1 | 0.9
Trade receivables, gross | 132.2 | 99.8
Allowance for doubtful receivables | (0.9) | (0.9)
Trade receivables, net | 131.3 | 98.9
Inventories. |  |
Finished products | 62.0 | 75.9
Work in process | 66.8 | 57.5
Raw materials | 52.3 | 58.1
Operating supplies and repairs and maintenance parts | 15.7 | 14.2
Total | 196.8 | 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 | 0.3 | 0.4
Short-term restricted cash | 0.9 | 7.8
Prepaid taxes | 3.0 | 3.8
Prepaid expenses | 6.1 | 3.9
Total | 74.7 | 78.9
Property, Plant and Equipment - Net. |  |
Land and improvements | 22.6 | 22.6
Buildings and leasehold improvements | 49.8 | 45.9
Machinery and equipment | 379.1 | 356.7
Construction in progress | 15.0 | 24.1
Active property, plant and equipment, gross | 466.5 | 449.3
Accumulated depreciation | (98.9) | (86.9)
Active property, plant and equipment, net | 367.6 | 362.4
Idled equipment | 5.4 | 5.4
Total | 373.0 | 367.8
Other Assets. |  |
Derivative assets - Notes 10 and 11 | 42.0 | 46.2
Option premiums paid - Notes 10 and 11 | 0.1 | 0.1
Restricted cash | 10.1 | 10.4
Long-term income tax receivable | 2.8 | 2.8
Deferred financing costs | 13.0 | 7.8
Available for sale securities | 5.5 | 4.9
Other | 0.3 | 0.1
Total | 73.8 | 72.3
Other Accrued Liabilities. |  |
Current derivative liabilities - Notes 10 and 11 | 13.5 | 14.8
Current portion of option premiums received - Notes 10 and 11 | 0.1 | 0.1
Accrued book overdraft (uncleared cash disbursement) | 6.2 | 0
Taxes payable | 4.5 | 2.6
Accrued freight | 2.8 | 2.4
Short-term environmental accrual - Note 9 | 1.7 | 1.2
Accrued interest | 4.1 | 2.3
Short-term deferred revenue - Note 1 | 9.0 | 13.5
Other | 4.4 | 4.1
Total | 46.3 | 41.0
Long-term Liabilities. |  |
Derivative liabilities - Notes 10 and 11 | 49.9 | 55.5
Option premiums received - Notes 10 and 11 | 0.1 | 0.1
Income tax liabilities | 13.7 | 13.4
Workers' compensation accruals | 20.6 | 20.8
Long-term environmental accrual - Note 9 | 20.3 | 20.8
Long-term asset retirement obligations | 4.0 | 3.8
Long-term deferred revenue - Note 1 | 1.6 | 3.3
Deferred compensation liability | 5.6 | 5.1
Other long-term liabilities | 2.9 | 3.2
Total | $ 118.7 | $ 126.0

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