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Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Cash and Cash Equivalents |  |
Cash and money market funds | $ 199.6 | $ 28.2
Commercial paper | 107.6 | 236.1
Total | 307.2 | 264.3
Trade Receivables – Net |  |
Allowance for doubtful receivables | (1.4) | (1.4)
Trade receivables – net | 175.2 | 167.1
Inventories |  |
Finished products | 43.1 | 42.6
Work-in-process | 89.8 | 63.5
Raw materials | 55.2 | 65.0
Operating supplies | 6.5 | 6.5
Total | 194.6 | 177.6
Property, Plant and Equipment – Net |  |
Land and improvements | 20.8 | 21.4
Buildings and leasehold improvements | 106.8 | 104.5
Machinery and equipment | 821.0 | 813.5
Construction in progress | 44.0 | 33.2
Property, plant and equipment – gross | 992.6 | 972.6
Accumulated depreciation | (364.0) | (352.2)
Assets held for sale | 2.3 | 1.6
Property, plant and equipment – net | 630.9 | 622.0
Other Accrued Liabilities |  |
Uncleared cash disbursements | 5.7 | 4.2
Accrued income taxes and taxes payable | 10.3 | 6.2
Accrued annual contribution to Salaried VEBA | 0.0 | 2.9
Accrued interest | 2.0 | 2.3
Short-term environmental accrual | 4.7 | 5.5
Other | 34.2 | 22.9
Total | 56.9 | 44.0
Long-Term Liabilities |  |
Workers’ compensation accruals | 28.5 | 27.7
Long-term environmental accrual | 12.3 | 11.5
Other long-term liabilities | 34.5 | 27.8
Total | 75.3 | 67.0
Excess of Replacement or Current Costs over Stated LIFO Value | $ 1.9 | $ 11.9
Workers' Compensation Discount, Percent | 1.00% | 1.75%
Workers compensation liability | $ 29.0 | $ 29.2
Billed |  |
Trade Receivables – Net |  |
Trade receivables, gross | $ 176.6 | $ 168.5

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