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Supplemental Balance Sheet Information - Schedule of Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Trade Receivables, Net |  |  |  |
Allowance for doubtful receivables |  | $ (0.8) | $ (0.6) |
Trade receivables, net |  | 319.7 | 325.2 |
Inventories |  |  |  |
Finished products |  | 103.7 | 89.3 |
Work-in-process |  | 193.3 | 210.8 |
Raw materials |  | 192.8 | 161.5 |
Operating supplies |  | 14.1 | 15.6 |
Inventories |  | 503.9 | 477.2 |
Property, Plant and Equipment, Net |  |  |  |
Land and improvements |  | 37.2 | 38.0 |
Buildings and leasehold improvements |  | 256.3 | 238.4 |
Machinery and equipment | [1] | 1,337.4 | 1,265.3 |
Construction in progress |  | 297.5 | 173.7 |
Property, plant and equipment, gross |  | 1,928.4 | 1,715.4 |
Accumulated depreciation and amortization |  | (767.5) | (663.7) |
Land held for sale |  | 0.3 | 0.4 |
Property, plant and equipment, net |  | 1,161.2 | 1,052.1 |
Other Assets |  |  |  |
Assets to be conveyed associated with Warrick acquisition | [1] | 18.3 | 56.8 |
Restricted cash - Note 16 |  | 19.5 | 18.3 | $ 13.9
Long-term replacement parts |  | 18.3 | 16.7 |
Other |  | 22.5 | 25.9 |
Other assets |  | 78.6 | 117.7 |
Other Accrued Liabilities |  |  |  |
Uncleared cash disbursements |  | 24.5 | 15.7 |
Accrued income taxes and other taxes payable |  | 11.2 | 9.5 |
Accrued annual contribution to Salaried VEBA - Note 5 |  | 0.7 | 1.1 |
Accrued interest |  | 9.9 | 9.9 |
Short-term environmental accrual - Note 10 |  | 0.7 | 2.8 |
Current operating lease liabilities - Note 3 |  | 6.3 | 8.0 |
Current finance lease liabilities - Note 3 |  | 2.4 | 2.1 |
Current deferred compensation plan liabilities - Note 5 |  | 6.7 | 0.4 |
Other - Note 8 |  | 17.0 | 14.8 |
Other accrued liabilities |  | 79.4 | 64.3 |
Long-Term Liabilities |  |  |  |
Workers' compensation accrual |  | 26.8 | 29.9 |
Long-term environmental accrual - Note 10 |  | 17.7 | 14.2 |
Other long-term liabilities |  | 39.5 | 37.6 |
Long-term liabilities |  | 84.0 | 81.7 |
Billed |  |  |  |
Trade Receivables, Net |  |  |  |
Billed trade receivables |  | $ 320.5 | $ 325.8 |
[1] | During the yea r ended Dece mber 31, 2024, $38.5 million of certain assets associated with our acquisition of Warrick were conveyed to us and placed in service. At December 31, 2024, such assets are presented within Machinery and equipment.

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