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Supplemental Balance Sheet Information | 9 Months Ended
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Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplemental Balance Sheet Information | 2. Supplemental Balance Sheet Information
|  | As of September 30, 2025 |  |  | As of December 31, 2024 As Adjusted 1 |
|  | (In millions of dollars) |
Trade Receivables, Net |  |  |  |  |  |
Billed trade receivables |  | $ | 389.5 |  |  | $ | 320.5 |
Allowance for doubtful receivables |  |  | (0.6 | ) |  |  | (0.8 | )
Trade receivables, net |  | $ | 388.9 |  |  | $ | 319.7 |
Inventories |  |  |  |  |  |
Finished products |  | $ | 144.1 |  |  | $ | 130.0 |
Work-in-process |  |  | 296.0 |  |  |  | 229.1 |
Raw materials |  |  | 246.8 |  |  |  | 228.7 |
Operating supplies |  |  | 15.4 |  |  |  | 14.1 |
Inventories |  | $ | 702.3 |  |  | $ | 601.9 |
Property, Plant and Equipment, Net |  |  |  |  |  |
Land and improvements |  | $ | 38.7 |  |  | $ | 37.2 |
Buildings and leasehold improvements |  |  | 320.9 |  |  |  | 256.3 |
Machinery and equipment 2 |  |  | 1,562.9 |  |  |  | 1,337.4 |
Construction in progress |  |  | 128.7 |  |  |  | 297.5 |
Property, plant and equipment, gross |  |  | 2,051.2 |  |  |  | 1,928.4 |
Accumulated depreciation and amortization |  |  | (851.5 | ) |  |  | (767.5 | )
Land held for sale |  |  | 0.1 |  |  |  | 0.3 |
Property, plant and equipment, net |  | $ | 1,199.8 |  |  | $ | 1,161.2 |
Other Assets |  |  |  |  |  |
Assets to be conveyed associated with Warrick acquisition 2 |  | $ | — |  |  | $ | 18.3 |
Restricted cash – Note 12 |  |  | 19.8 |  |  |  | 19.5 |
Long-term replacement parts |  |  | 25.5 |  |  |  | 18.3 |
Other |  |  | 16.4 |  |  |  | 22.5 |
Other assets |  | $ | 61.7 |  |  | $ | 78.6 |
Other Accrued Liabilities |  |  |  |  |  |
Uncleared cash disbursements |  | $ | 1.4 |  |  | $ | 24.5 |
Accrued income taxes and other taxes payable |  |  | 11.5 |  |  |  | 11.1 |
Accrued annual contribution to Salaried VEBA |  |  | — |  |  |  | 0.7 |
Accrued interest |  |  | 10.5 |  |  |  | 9.9 |
Short-term environmental accrual – Note 7 |  |  | 0.7 |  |  |  | 0.7 |
Current operating lease liabilities |  |  | 5.3 |  |  |  | 6.3 |
Current finance lease liabilities |  |  | 2.4 |  |  |  | 2.4 |
Current deferred compensation plan liabilities – Note 3 |  |  | 0.4 |  |  |  | 6.7 |
Other – Note 5 |  |  | 17.3 |  |  |  | 17.0 |
Other accrued liabilities |  | $ | 49.5 |  |  | $ | 79.3 |
Long-Term Liabilities |  |  |  |  |  |
Workers' compensation accrual |  | $ | 27.7 |  |  | $ | 26.8 |
Long-term environmental accrual – Note 7 |  |  | 17.5 |  |  |  | 17.7 |
Other long-term liabilities |  |  | 39.2 |  |  |  | 39.5 |
Long-term liabilities |  | $ | 84.4 |  |  | $ | 84.0 |
1. Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion. 2. 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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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/210/tableOfContent + Details
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