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Supplemental Balance Sheet Information - Schedule of Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Trade Receivables, Net |  |
Allowance for doubtful receivables | $ (0.6) | $ (0.8)
Trade receivables, net | 432.2 | 332.7
Inventories |  |
Finished products | 83.7 | 90.3
Work-in-process | 169.2 | 162.2
Raw materials | 169.0 | 143.0
Operating supplies | 9.6 | 9.1
Total | 431.5 | 404.6
Property, Plant and Equipment, Net |  |
Land and improvements | 26.5 | 26.0
Buildings and leasehold improvements | 182.5 | 179.0
Machinery and equipment | 1,160.4 | 1,151.5
Construction in progress | 89.8 | 75.3
Property, plant and equipment, gross | 1,459.2 | 1,431.8
Accumulated depreciation and amortization | (503.4) | (480.4)
Assets held for sale | 4.4 | 3.8
Property, plant and equipment, net | 960.2 | 955.2
Other Accrued Liabilities |  |
Uncleared cash disbursements | 16.7 | 10.9
Accrued income taxes and other taxes payable | 16.3 | 9.5
Accrued interest | 10.3 | 9.9
Short-term environmental accrual | 2.3 | 2.6
Other | 25.3 | 25.5
Total | 70.9 | 58.4
Long-Term Liabilities |  |
Workers' compensation accrual | 31.8 | 31.9
Long-term environmental accrual | 14.1 | 14.2
Other long-term liabilities | 28.5 | 26.4
Total | 74.4 | 72.5
Billed |  |
Trade Receivables, Net |  |
Billed trade receivables | $ 432.8 | $ 333.5

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