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Supplemental Balance Sheet Information (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Trade Receivables |  |
Billed trade receivables | $ 98.9 | $ 82.5
Unbilled trade receivables - Note 1 | 0.9 | 1.1
Trade receivables, gross | 99.8 | 83.6
Allowance for doubtful receivables | (0.9) | (0.6)
Trade receivables, net | 98.9 | 83.0
Inventories |  |
Finished products | 75.9 | 53.8
Work in process | 57.5 | 49.6
Raw materials | 58.1 | 50.9
Operating supplies and repairs and maintenance parts | 14.2 | 13.2
Total | 205.7 | 167.5
Prepaid Expense and Other Current Assets |  |
Current derivative assets - Notes 12 and 13 | 0 | 22.1
Current deferred tax assets | 63.0 | 46.8
Current portion of option premiums paid - Notes 12 and 13 | 0.4 | 5.6
Short-term restricted cash | 7.8 | 0.9
Prepaid taxes | 3.8 | 1.3
Prepaid expenses | 3.9 | 3.4
Total | 78.9 | 80.1
Property, Plant and Equipment |  |
Land and land improvements | 22.6 | 23.3
Buildings and leasehold improvements | 45.9 | 43.5
Machinery and equipment | 356.7 | 338.0
Construction in progress | 24.1 | 7.7
Active property, plant and equipment, gross | 449.3 | 412.5
Accumulated depreciation | (86.9) | (63.9)
Active property, plant and equipment, net | 362.4 | 348.6
Idled equipment | 5.4 | 5.5
Property, plant, and equipment, net | 367.8 | 354.1
Other Assets |  |
Derivative assets - Notes 12 and 13 | 46.2 | 50.8
Option premiums paid - Notes 12 and 13 | 0.1 | 0.6
Restricted cash | 10.4 | 16.3
Long-term income tax receivable | 2.8 | 2.9
Deferred financing costs | 7.8 | 7.7
Available for sale securities | 4.9 | 4.6
Other | 0.1 | 0.1
Total | 72.3 | 83.0
Other Accrued Liabilities |  |
Current derivative liabilities - Notes 12 and 13 | 14.8 | 8.9
Current portion of option premiums received - Notes 12 and 13 | 0.1 | 7.0
Current portion of income tax liabilities | 0 | 1.1
Accrued income taxes and taxes payable | 2.6 | 1.8
Accrued annual VEBA contribution | 0 | 2.1
Accrued freight | 2.4 | 1.9
Short-term environmental accrual - Note 11 | 1.2 | 1.1
Accrued interest | 2.3 | 2.1
Short-term deferred revenue - Note 1 | 13.5 | 10.8
Other | 4.1 | 5.2
Total | 41.0 | 42.0
Other Liabilities, Noncurrent [Abstract] |  |
Derivative liabilities - Notes 12 and 13 | 55.5 | 62.2
Option premiums received - Notes 12 and 13 | 0.1 | 0.3
Income tax liabilities | 13.4 | 12.9
Workers' compensation accruals | 20.8 | 15.9
Long-term environmental accrual - Note 11 | 20.8 | 19.1
Long-term asset retirement obligations | 3.8 | 3.8
Long-term deferred revenue - Note 1 | 3.3 | 13.2
Deferred compensation liability | 5.1 | 4.9
Other long-term liabilities | 3.2 | 2.4
Total | $ 126.0 | $ 134.7

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