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v3.21.2

Supplemental Balance Sheet Information - Schedule of Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Trade Receivables, Net |  |
Allowance for doubtful receivables | $ (0.8) | $ (0.8)
Trade receivables, net | 361.6 | 112.8
Inventories |  |
Finished products | 81.9 | 37.2
Work-in-process | 163.2 | 46.0
Raw materials | 159.6 | 62.3
Operating supplies | 8.9 | 6.5
Total | 413.6 | 152.0
Property, Plant and Equipment, Net |  |
Land and improvements | 26.0 | 21.5
Buildings and leasehold improvements | 174.7 | 117.2
Machinery and equipment | 1,119.7 | 847.4
Construction in progress | 82.3 | 37.8
Property, plant and equipment, gross | 1,402.7 | 1,023.9
Accumulated depreciation and amortization | (456.1) | (398.4)
Assets held for sale | 2.1 | 1.7
Property, plant and equipment, net | 948.7 | 627.2
Other Accrued Liabilities |  |
Uncleared cash disbursements | 7.1 | 2.1
Accrued income taxes and other taxes payable | 11.0 | 5.2
Accrued annual contribution to Salaried VEBA |  | 1.7
Accrued interest | 11.0 | 11.6
Short-term environmental accrual | 3.9 | 3.7
Other | 22.2 | 17.1
Total | 55.2 | 41.4
Long-Term Liabilities |  |
Workers' compensation accrual | 30.9 | 30.6
Long-term environmental accrual | 13.3 | 15.1
Other long-term liabilities | 30.3 | 31.6
Total | 74.5 | 77.3
Billed |  |
Trade Receivables, Net |  |
Billed trade receivables | $ 362.4 | $ 113.6

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