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Supplemental Balance Sheet Information - Schedule of Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Trade Receivables, Net |  |
Allowance for doubtful receivables | $ (0.6) | $ (0.8)
Trade receivables, net | 351.1 | 332.7
Inventories |  |
Finished products | 66.9 | 90.3
Work-in-process | 160.3 | 162.2
Raw materials | 230.2 | 143.0
Operating supplies | 11.2 | 9.1
Total | 468.6 | 404.6
Property, Plant and Equipment, Net |  |
Land and improvements | 26.4 | 26.0
Buildings and leasehold improvements | 184.5 | 179.0
Machinery and equipment | 1,171.7 | 1,151.5
Construction in progress | 99.8 | 75.3
Property, plant and equipment, gross | 1,482.4 | 1,431.8
Accumulated depreciation and amortization | (526.5) | (480.4)
Assets held for sale | 0.4 | 3.8
Property, plant and equipment, net | 956.3 | 955.2
Other Accrued Liabilities |  |
Uncleared cash disbursements | 11.1 | 10.9
Accrued income taxes and other taxes payable | 11.7 | 9.5
Accrued interest | 9.9 | 9.9
Short-term environmental accrual | 2.8 | 2.6
Other | 51.8 | 25.5
Total | 87.3 | 58.4
Long-Term Liabilities |  |
Workers' compensation accrual | 31.8 | 31.9
Long-term environmental accrual | 13.2 | 14.2
Other long-term liabilities | 28.6 | 26.4
Total | 73.6 | 72.5
Billed |  |
Trade Receivables, Net |  |
Billed trade receivables | $ 351.7 | $ 333.5

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