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Supplemental Balance Sheet Information - Schedule of Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023
--- | --- | --- | ---
Trade Receivables, Net |  |  |  |
Allowance for doubtful receivables |  | $ (0.6) | $ (0.6) |
Trade receivables, net |  | 341.4 | 325.2 |
Inventories |  |  |  |
Finished products | [1] | 81.0 | 89.3 |
Work-in-process | [1] | 209.5 | 210.8 |
Raw materials | [1] | 165.0 | 161.5 |
Operating supplies | [1] | 15.8 | 15.6 |
Inventories | [1] | 471.3 | 477.2 |
Property, Plant and Equipment, Net |  |  |  |
Land and improvements |  | 37.2 | 38.0 |
Buildings and leasehold improvements |  | 240.0 | 238.4 |
Machinery and equipment |  | 1,272.8 | 1,265.3 |
Construction in progress |  | 193.8 | 173.7 |
Property, plant and equipment, gross |  | 1,743.8 | 1,715.4 |
Accumulated depreciation and amortization |  | (690.3) | (663.7) |
Land held for sale |  | 1.5 | 0.4 |
Property, plant and equipment, net |  | 1,055.0 | 1,052.1 |
Other Assets |  |  |  |
Assets to be conveyed associated with Warrick acquisition |  | 56.8 | 56.8 |
Restricted cash - Note 12 |  | 18.3 | 18.3 | $ 18.6
Long-term replacement parts |  | 17.2 | 16.7 |
Other |  | 25.8 | 25.9 |
Other assets |  | 118.1 | 117.7 |
Other Accrued Liabilities |  |  |  |
Uncleared cash disbursements |  | 16.8 | 15.7 |
Accrued income taxes and other taxes payable |  | 13.1 | 9.5 |
Accrued annual contribution to Salaried VEBA |  |  | 1.1 |
Accrued interest |  | 10.3 | 9.9 |
Short-term environmental accrual - Note 7 |  | 0.5 | 2.8 |
Current operating lease liabilities |  | 7.7 | 8.0 |
Current finance lease liabilities |  | 2.3 | 2.1 |
Other - Note 5 |  | 14.7 | 15.2 |
Other accrued liabilities |  | 65.4 | 64.3 |
Long-Term Liabilities |  |  |  |
Workers' compensation accrual |  | 29.2 | 29.9 |
Long-term environmental accrual - Note 7 |  | 15.6 | 14.2 |
Other long-term liabilities |  | 38.8 | 37.6 |
Long-term liabilities |  | 83.6 | 81.7 |
Billed |  |  |  |
Trade Receivables, Net |  |  |  |
Billed trade receivables |  | $ 342.0 | $ 325.8 |
[1] | At March 31, 2024 and December 31, 2023, the current cost of our inventory exceeded its stated last-in, first-out (“LIFO”) value by $42.6 million and $56.0 million, respectively.

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