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Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Cash and Cash Equivalents |  |
Cash and money market funds | $ 29.3 | $ 22.9
Commercial paper | 86.0 | 102.7
Total | 115.3 | 125.6
Trade Receivables – Net |  |
Trade receivables, gross | 196.6 | 180.6
Allowance for doubtful receivables | (0.8) | (0.8)
Trade receivables – net | 195.8 | 179.8
Inventories |  |
Finished products | 47.1 | 48.0
Work-in-process | 104.9 | 85.6
Raw materials | 74.8 | 75.0
Operating supplies | 7.1 | 6.5
Total | 233.9 | 215.1
Property, Plant and Equipment – Net |  |
Land and improvements | 21.4 | 21.4
Buildings and leasehold improvements | 97.8 | 97.0
Machinery and equipment | 766.9 | 755.6
Construction in progress | 41.8 | 43.6
Property, plant and equipment – gross | 927.9 | 917.6
Accumulated depreciation | (318.6) | (307.4)
Assets held for sale | 1.6 | 1.6
Property, plant and equipment – net | 610.9 | 611.8
Other Accrued Liabilities |  |
Uncleared cash disbursements | 6.6 | 4.8
Accrued income taxes and taxes payable | 9.9 | 6.5
Accrued annual contribution to Salaried VEBA | 0.0 | 2.1
Accrued interest | 8.4 | 2.9
Other | 26.7 | 27.7
Total | 51.6 | 44.0
Long-Term Liabilities |  |
Workers’ compensation accruals | 25.5 | 24.6
Long-term environmental accrual | 13.1 | 14.3
Other long-term liabilities | 23.2 | 27.5
Total | 61.8 | 66.4
Billed |  |
Trade Receivables – Net |  |
Trade receivables, gross | 196.6 | 179.5
Unbilled |  |
Trade Receivables – Net |  |
Trade receivables, gross | $ 0.0 | $ 1.1

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