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Supplemental Balance Sheet Information (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Cash and Cash Equivalents. |  |  |  |
Cash and money market funds |  | $ 57.7 |  |
Commercial paper |  | 111.8 |  |
Total | 212.3 | 169.5 | 224.6 | 273.4
Trade Receivables - Net. |  |  |  |
Trade receivables, gross | 133.2 | 120.6 |  |
Allowance for doubtful receivables | (0.8) | (0.8) |  |
Trade receivables - net | 132.4 | 119.8 |  |
Inventories. |  |  |  |
Finished products | 64.9 | 72.5 |  |
Work-in-process | 70.5 | 75.9 |  |
Raw materials | 56.0 | 47.2 |  |
Operating supplies and repair and maintenance parts | 19.9 | 18.8 |  |
Total | 211.3 | 214.4 |  |
Prepaid Expenses and Other Current Assets. |  |  |  |
Current derivative assets – Notes 8 and 9 | 101.6 | 2.0 |  |
Current deferred tax assets | 47.8 | 36.7 |  |
Short-term restricted cash | 0.3 | 0.3 |  |
Prepaid taxes | 1.0 | 0 |  |
Other | 5.7 | 5.2 |  |
Total | 156.4 | 44.2 |  |
Property, Plant and Equipment - Net. |  |  |  |
Land and improvements | 22.8 | 22.6 |  |
Buildings and leasehold improvements | 62.4 | 53.0 |  |
Machinery and equipment | 500.0 | 425.6 |  |
Construction in progress | 18.1 | 66.0 |  |
Active property, plant and equipment, gross | 603.3 | 567.2 |  |
Accumulated depreciation | (160.4) | (137.9) |  |
Property, plant and equipment - net | 442.9 | 429.3 |  |
Other Assets. |  |  |  |
Derivative assets – Notes 8 and 9 | 0.2 | 79.8 |  |
Restricted cash | 10.0 | 9.3 |  |
Deferred financing costs | 6.3 | 8.9 |  |
Deferred compensation plan assets | 7.2 | 6.5 |  |
Other | 0.1 | 0.3 |  |
Total | 23.8 | 104.8 |  |
Other Accrued Liabilities. |  |  |  |
Current derivative liabilities – Notes 8 and 9 | 101.9 | 1.8 |  |
Uncleared cash disbursements | 6.6 | 9.6 |  |
Accrued income taxes and taxes payable | 6.3 | 4.3 |  |
Accrued annual VEBA contribution | 0 | 16.0 |  |
Short-term environmental accrual – Note 7 | 3.3 | 2.8 |  |
Accrued interest | 10.3 | 3.7 |  |
Deferred Revenue, Current | 0.2 | 0 |  |
Other | 3.1 | 6.6 |  |
Total | 131.7 | 44.8 |  |
Long-Term Liabilities. |  |  |  |
Derivative liabilities – Notes 8 and 9 | 0.6 | 84.3 |  |
Income tax liabilities | 5.0 | 5.0 |  |
Workers’ compensation accruals | 23.0 | 23.3 |  |
Long-term environmental accrual – Note 7 | 16.9 | 20.0 |  |
Long-term asset retirement obligations | 4.3 | 4.0 |  |
Deferred compensation liability | 7.6 | 7.0 |  |
Deferred Revenue, Noncurrent | 0.6 | 0 |  |
Long-term capital leases | 0.1 | 0.1 |  |
Other long-term liabilities | 2.8 | 2.7 |  |
Total | 60.9 | 146.4 |  |
Long-Term Debt — Note 3. |  |  |  |
Senior notes | 225.0 | 225.0 |  |
Cash convertible senior notes | 0 | 163.5 |  |
Total | 225.0 | 388.5 |  |
Billed |  |  |  |
Trade Receivables - Net. |  |  |  |
Trade receivables, gross | 132.2 | 120.2 |  |
Unbilled |  |  |  |
Trade Receivables - Net. |  |  |  |
Trade receivables, gross | 1.0 | 0.4 |  |
Recurring |  |  |  |
Cash and Cash Equivalents. |  |  |  |
Cash and cash equivalents | 212.3 | 169.5 |  |
Other Assets. |  |  |  |
Deferred compensation plan assets | 7.2 | 6.5 |  |
Fair Value, Inputs, Level 1 [Member] | Recurring |  |  |  |
Cash and Cash Equivalents. |  |  |  |
Cash and cash equivalents | 35.4 | 57.7 |  |
Other Assets. |  |  |  |
Deferred compensation plan assets | 0 | 0 |  |
Level 2 | Recurring |  |  |  |
Cash and Cash Equivalents. |  |  |  |
Cash and cash equivalents | 176.9 | 111.8 |  |
Other Assets. |  |  |  |
Deferred compensation plan assets |  | $ 6.5 |  |

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