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Supplemental Balance Sheet Information | 6 Months Ended
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Jun. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplemental Balance Sheet Information | 2. Supplemental Balance Sheet Information
|  | As of June 30, 2024 |  |  | As of December 31, 2023 |
|  | (In millions of dollars) |
Trade Receivables, Net |  |  |  |  |  |
Billed trade receivables |  | $ | 370.9 |  |  | $ | 325.8 |
Allowance for doubtful receivables |  |  | (0.8 | ) |  |  | (0.6 | )
Trade receivables, net |  | $ | 370.1 |  |  | $ | 325.2 |
Inventories 1 |  |  |  |  |  |
Finished products |  | $ | 72.1 |  |  | $ | 89.3 |
Work-in-process |  |  | 210.2 |  |  |  | 210.8 |
Raw materials |  |  | 148.0 |  |  |  | 161.5 |
Operating supplies |  |  | 16.6 |  |  |  | 15.6 |
Inventories |  | $ | 446.9 |  |  | $ | 477.2 |
Property, Plant and Equipment, Net |  |  |  |  |  |
Land and improvements |  | $ | 37.2 |  |  | $ | 38.0 |
Buildings and leasehold improvements |  |  | 241.6 |  |  |  | 238.4 |
Machinery and equipment |  |  | 1,279.7 |  |  |  | 1,265.3 |
Construction in progress |  |  | 240.1 |  |  |  | 173.7 |
Property, plant and equipment, gross |  |  | 1,798.6 |  |  |  | 1,715.4 |
Accumulated depreciation and amortization |  |  | (715.5 | ) |  |  | (663.7 | )
Land held for sale |  |  | 1.5 |  |  |  | 0.4 |
Property, plant and equipment, net |  | $ | 1,084.6 |  |  | $ | 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 |
Long-term replacement parts |  |  | 17.3 |  |  |  | 16.7 |
Other |  |  | 26.6 |  |  |  | 25.9 |
Other assets |  | $ | 119.0 |  |  | $ | 117.7 |
Other Accrued Liabilities |  |  |  |  |  |
Uncleared cash disbursements |  | $ | 20.0 |  |  | $ | 15.7 |
Accrued income taxes and other taxes payable |  |  | 10.8 |  |  |  | 9.5 |
Accrued annual contribution to Salaried VEBA |  |  | — |  |  |  | 1.1 |
Accrued interest |  |  | 9.9 |  |  |  | 9.9 |
Short-term environmental accrual – Note 7 |  |  | 0.5 |  |  |  | 2.8 |
Current operating lease liabilities |  |  | 7.2 |  |  |  | 8.0 |
Current finance lease liabilities |  |  | 2.5 |  |  |  | 2.1 |
Other – Note 5 |  |  | 14.8 |  |  |  | 15.2 |
Other accrued liabilities |  | $ | 65.7 |  |  | $ | 64.3 |
Long-Term Liabilities |  |  |  |  |  |
Workers' compensation accrual |  | $ | 29.7 |  |  | $ | 29.9 |
Long-term environmental accrual – Note 7 |  |  | 14.8 |  |  |  | 14.2 |
Other long-term liabilities |  |  | 43.8 |  |  |  | 37.6 |
Long-term liabilities |  | $ | 88.3 |  |  | $ | 81.7 |
1. At June 30, 2024 and December 31, 2023, the current cost of our inventory exceeded its stated last-in, first-out (“LIFO”) value by $83.5 million and $56.0 million, respectively.

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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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