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v3.25.3

Supplemental Balance Sheet Information - Schedule of Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | --- | ---
Trade Receivables, Net |  |  |  |  |  |
Allowance for doubtful receivables |  | $ (0.6) |  | $ (0.8) | [1] |
Trade receivables, net |  | 388.9 |  | 319.7 | [1],[2] |
Inventories |  |  |  |  |  |
Finished products |  | 144.1 |  | 130.0 | [1] |
Work-in-process |  | 296.0 |  | 229.1 | [1] |
Raw materials |  | 246.8 |  | 228.7 | [1] |
Operating supplies |  | 15.4 |  | 14.1 | [1] |
Inventories |  | 702.3 |  | 601.9 | [1],[2] | $ 555.5
Property, Plant and Equipment, Net |  |  |  |  |  |
Land and improvements |  | 38.7 |  | 37.2 | [1] |
Buildings and leasehold improvements |  | 320.9 |  | 256.3 | [1] |
Machinery and equipment | [3] | 1,562.9 |  | 1,337.4 | [1] |
Construction in progress |  | 128.7 |  | 297.5 | [1] |
Property, plant and equipment, gross |  | 2,051.2 |  | 1,928.4 | [1] |
Accumulated depreciation and amortization |  | (851.5) |  | (767.5) | [1] |
Land held for sale |  | 0.1 |  | 0.3 | [1] |
Property, plant and equipment, net |  | 1,199.8 |  | 1,161.2 | [1],[2] |
Other Assets |  |  |  |  |  |
Assets to be conveyed associated with Warrick acquisition |  |  | $ 18.3 | 18.3 | [1],[3] |
Restricted cash - Note 12 |  | 19.8 |  | 19.5 | [1] | $ 18.3
Long-term replacement parts |  | 25.5 |  | 18.3 | [1] |
Other |  | 16.4 |  | 22.5 | [1] |
Other assets |  | 61.7 |  | 78.6 | [1],[2] |
Other Accrued Liabilities |  |  |  |  |  |
Uncleared cash disbursements |  | 1.4 |  | 24.5 | [1] |
Accrued income taxes and other taxes payable |  | 11.5 |  | 11.1 | [1] |
Accrued annual contribution to Salaried VEBA | [1] |  |  | 0.7 |  |
Accrued interest |  | 10.5 |  | 9.9 | [1] |
Short-term environmental accrual - Note 7 |  | 0.7 |  | 0.7 | [1] |
Current operating lease liabilities |  | 5.3 |  | 6.3 | [1] |
Current finance lease liabilities |  | 2.4 |  | 2.4 | [1] |
Current deferred compensation plan liabilities - Note 3 |  | 0.4 |  | 6.7 |  |
Other - Note 5 |  | 17.3 |  | 17.0 | [1] |
Other accrued liabilities |  | 49.5 |  | 79.3 | [1],[2] |
Long-Term Liabilities |  |  |  |  |  |
Workers' compensation accrual |  | 27.7 |  | 26.8 | [1] |
Long-term environmental accrual - Note 7 |  | 17.5 |  | 17.7 | [1] |
Other long-term liabilities |  | 39.2 |  | 39.5 | [1] |
Long-term liabilities |  | 84.4 |  | 84.0 | [1],[2] |
Billed |  |  |  |  |  |
Trade Receivables, Net |  |  |  |  |  |
Billed trade receivables |  | $ 389.5 |  | $ 320.5 | [1] |
[1] | Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.
[2] | Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.
[3] | During the quarter ended March 31, 2025, $18.3 million of certain assets associated with our acquisition of Warrick were conveyed to us and placed in service. At September 30, 2025, such assets are presented within Machinery and equipment.

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