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Supplemental Balance Sheet Information | 9 Months Ended
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Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplemental Balance Sheet Information | 2. Supplemental Balance Sheet Information
|  | As of September 30, 2023 |  |  | As of December 31, 2022 |
|  | (In millions of dollars) |
Trade Receivables, Net |  |  |  |  |  |
Billed trade receivables |  | $ | 352.1 |  |  | $ | 297.7 |
Allowance for doubtful receivables |  |  | (0.6 | ) |  |  | (0.5 | )
Trade receivables, net |  | $ | 351.5 |  |  | $ | 297.2 |
Inventories 1 |  |  |  |  |  |
Finished products |  | $ | 98.8 |  |  | $ | 98.0 |
Work-in-process |  |  | 217.0 |  |  |  | 242.5 |
Raw materials |  |  | 158.3 |  |  |  | 174.0 |
Operating supplies |  |  | 14.5 |  |  |  | 10.9 |
Inventories |  | $ | 488.6 |  |  | $ | 525.4 |
Property, Plant and Equipment, Net |  |  |  |  |  |
Land and improvements |  | $ | 38.4 |  |  | $ | 28.4 |
Buildings and leasehold improvements |  |  | 199.6 |  |  |  | 185.5 |
Machinery and equipment |  |  | 1,255.4 |  |  |  | 1,232.7 |
Construction in progress |  |  | 203.1 |  |  |  | 141.3 |
Property, plant and equipment, gross |  |  | 1,696.5 |  |  |  | 1,587.9 |
Accumulated depreciation and amortization |  |  | (639.0 | ) |  |  | (574.9 | )
Assets held for sale |  |  | — |  |  |  | 0.2 |
Property, plant and equipment, net |  | $ | 1,057.5 |  |  | $ | 1,013.2 |
Other Accrued Liabilities |  |  |  |  |  |
Uncleared cash disbursements |  | $ | 23.3 |  |  | $ | 13.6 |
Accrued income taxes and other taxes payable |  |  | 10.7 |  |  |  | 8.9 |
Accrued interest |  |  | 10.3 |  |  |  | 9.9 |
Short-term environmental accrual – Note 7 |  |  | 1.1 |  |  |  | 1.1 |
Short-term operating lease liabilities |  |  | 8.2 |  |  |  | 9.1 |
Short-term finance lease liabilities |  |  | 2.1 |  |  |  | 2.1 |
Other – Note 5 |  |  | 17.4 |  |  |  | 23.7 |
Other accrued liabilities |  | $ | 73.1 |  |  | $ | 68.4 |
Long-Term Liabilities |  |  |  |  |  |
Workers' compensation accrual |  | $ | 32.2 |  |  | $ | 30.9 |
Long-term environmental accrual – Note 7 |  |  | 16.7 |  |  |  | 16.6 |
Other long-term liabilities |  |  | 36.6 |  |  |  | 27.2 |
Long-term liabilities |  | $ | 85.5 |  |  | $ | 74.7 |
1 At September 30, 2023 and December 31, 2022, the current cost of our inventory exceeded its stated last-in, first-out (“LIFO”) value by $58.7 million and $84.6 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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