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Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Cash and Cash Equivalents |  |
Cash and money market funds | $ 42.3 | $ 29.5
Commercial paper | 12.0 | 148.2
Total | 54.3 | 177.7
Trade Receivables – Net |  |
Trade receivables, gross | 139.4 | 130.1
Allowance for doubtful receivables | (0.8) | (0.8)
Trade receivables – net | 138.6 | 129.3
Inventories |  |
Finished products | 64.6 | 73.6
Work-in-process | 70.2 | 66.7
Raw materials | 60.4 | 54.2
Operating supplies and repair and maintenance parts | 22.1 | 20.2
Total | 217.3 | 214.7
Prepaid Expenses and Other Current Assets |  |
Current derivative assets – Notes 8 and 9 | 0.3 | 85.7
Current deferred tax assets | 92.2 | 86.4
Short-term restricted cash | 0.3 | 0.3
Prepaid taxes | 2.0 | 0.0
Other | 5.6 | 6.2
Total | 100.4 | 178.6
Property, Plant and Equipment – Net |  |
Land and improvements | 22.7 | 22.9
Buildings and leasehold improvements | 64.1 | 63.8
Machinery and equipment | 523.2 | 509.8
Construction in progress | 36.1 | 25.2
Property, plant and equipment – gross | 646.1 | 621.7
Accumulated depreciation | (181.9) | (166.8)
Assets held for sale | 0.3 | 0.0
Property, plant and equipment – net | 464.5 | 454.9
Other Assets |  |
Restricted cash | 10.4 | 10.0
Deferred financing costs | 5.0 | 5.9
Deferred compensation plan assets | 7.6 | 7.3
Other | 0.1 | 0.1
Total | 23.1 | 23.3
Other Accrued Liabilities |  |
Current derivative liabilities – Notes 8 and 9 | 15.6 | 94.9
Uncleared cash disbursements | 5.0 | 9.1
Accrued income taxes and taxes payable | 6.3 | 5.2
Accrued annual contribution to VEBAs | 0.0 | 13.7
Accrued contingent contribution to Union VEBA - Note 5 | 17.1 | 0.0
Short-term environmental accruals – Note 7 | 2.2 | 2.3
Accrued interest | 1.7 | 3.7
Short-term deferred revenue | 0.2 | 0.2
Other | 3.5 | 3.7
Total | 51.6 | 132.8
Long-Term Liabilities |  |
Derivative liabilities – Notes 8 and 9 | 2.0 | 1.9
Income tax liabilities | 0.7 | 2.4
Workers’ compensation accruals | 20.7 | 21.5
Long-term environmental accruals – Note 7 | 17.3 | 17.0
Long-term asset retirement obligations | 4.7 | 4.4
Deferred compensation liabilities | 7.8 | 7.2
Long-term deferred revenue | 0.4 | 0.5
Long-term capital leases | 0.1 | 0.1
Long-term portion of contingent contribution to Union VEBA – Note 5 | 29.9 | 0.0
Other long-term liabilities | 3.2 | 3.3
Total | 86.8 | 58.3
Billed |  |
Trade Receivables – Net |  |
Trade receivables, gross | 138.6 | 128.7
Unbilled |  |
Trade Receivables – Net |  |
Trade receivables, gross | $ 0.8 | $ 1.4

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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