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Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Cash and Cash Equivalents |  |  |
Cash and money market funds | $ 23.2 |  | $ 23.5
Commercial paper | 71.1 |  | 27.6
Total | 94.3 |  | 51.1
Trade Receivables – Net |  |  |
Trade receivables, gross | 195.7 |  | 166.2
Allowance for doubtful receivables | (1.2) |  | (1.2)
Trade receivables – net | 194.5 |  | 165.0
Inventories |  |  |
Finished products | 41.4 |  | 63.8
Work-in-process | 73.3 |  | 78.3
Raw materials | 76.2 |  | 61.3
Operating supplies | 5.3 |  | 4.5
Total | 196.2 | $ 167.2 | 207.9
Property, Plant and Equipment – Net |  |  |
Land and improvements | 21.4 |  | 21.1
Buildings and leasehold improvements | 96.4 |  | 92.1
Machinery and equipment | 736.3 |  | 689.1
Construction in progress | 38.1 |  | 35.1
Property, plant and equipment – gross | 892.2 |  | 837.4
Accumulated depreciation | (298.4) |  | (267.9)
Assets held for sale | 1.6 |  | 1.9
Property, plant and equipment – net | 595.4 |  | 571.4
Other Accrued Liabilities |  |  |
Uncleared cash disbursements | 5.6 |  | 7.3
Accrued income taxes and taxes payable | 8.2 |  | 6.8
Accrued annual contribution to VEBAs | 0.0 |  | 15.7
Accrued interest | 8.4 |  | 2.9
Other | 14.8 |  | 7.8
Total | 37.0 | $ 42.0 | 40.5
Long-Term Liabilities |  |  |
Workers’ compensation accruals | 24.5 |  | 22.6
Long-term environmental accrual | 14.4 |  | 15.8
Other long-term liabilities | 25.8 |  | 21.6
Total | 64.7 |  | 60.0
Billed |  |  |
Trade Receivables – Net |  |  |
Trade receivables, gross | 194.2 |  | 165.9
Unbilled |  |  |
Trade Receivables – Net |  |  |
Trade receivables, gross | $ 1.5 |  | $ 0.3

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