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Supplemental Balance Sheet Information | 12 Months Ended
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Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplemental Balance Sheet Information | 2. Supplemental Balance Sheet Information
|  | As of December 31, |
|  | 2023 |  |  | 2022 |
|  | (In millions of dollars) |
Trade Receivables, Net |  |  |  |  |  |
Billed trade receivables |  | $ | 325.8 |  |  | $ | 297.7 |
Allowance for doubtful receivables |  |  | (0.6 | ) |  |  | (0.5 | )
Trade receivables, net |  | $ | 325.2 |  |  | $ | 297.2 |
Inventories |  |  |  |  |  |
Finished products |  | $ | 89.3 |  |  | $ | 98.0 |
Work-in-process |  |  | 210.8 |  |  |  | 242.5 |
Raw materials |  |  | 161.5 |  |  |  | 174.0 |
Operating supplies |  |  | 15.6 |  |  |  | 10.9 |
Inventories |  | $ | 477.2 |  |  | $ | 525.4 |
Property, Plant and Equipment, Net |  |  |  |  |  |
Land and improvements |  | $ | 38.0 |  |  | $ | 28.4 |
Buildings and leasehold improvements |  |  | 238.4 |  |  |  | 185.5 |
Machinery and equipment |  |  | 1,265.3 |  |  |  | 1,232.7 |
Construction in progress |  |  | 173.7 |  |  |  | 141.3 |
Property, plant and equipment, gross |  |  | 1,715.4 |  |  |  | 1,587.9 |
Accumulated depreciation and amortization |  |  | (663.7 | ) |  |  | (574.9 | )
Land held for sale |  |  | 0.4 |  |  |  | 0.2 |
Property, plant and equipment, net |  | $ | 1,052.1 |  |  | $ | 1,013.2 |
Other Assets |  |  |  |  |  |
Assets to be conveyed associated with Warrick acquisition |  | $ | 56.8 |  |  | $ | 56.8 |
Restricted cash – Note 16 |  |  | 18.3 |  |  |  | 13.9 |
Long-term replacement parts |  |  | 16.7 |  |  |  | 15.5 |
Other |  |  | 25.9 |  |  |  | 26.1 |
Other assets |  | $ | 117.7 |  |  | $ | 112.3 |
. |  |  |  |  |  |
Other Accrued Liabilities |  |  |  |  |  |
Uncleared cash disbursements |  | $ | 15.7 |  |  | $ | 13.6 |
Accrued income taxes and other taxes payable |  |  | 9.5 |  |  |  | 8.9 |
Accrued annual contribution to Salaried VEBA – Note 5 |  |  | 1.1 |  |  |  | — |
Accrued interest |  |  | 9.9 |  |  |  | 9.9 |
Short-term environmental accrual – Note 10 |  |  | 2.8 |  |  |  | 1.1 |
Current operating lease liabilities – Note 3 |  |  | 8.0 |  |  |  | 9.1 |
Current finance lease liabilities – Note 3 |  |  | 2.1 |  |  |  | 2.1 |
Other – Note 8 |  |  | 15.2 |  |  |  | 23.7 |
Other accrued liabilities |  | $ | 64.3 |  |  | $ | 68.4 |
Long-Term Liabilities |  |  |  |  |  |
Workers' compensation accrual |  | $ | 29.9 |  |  | $ | 30.9 |
Long-term environmental accrual – Note 10 |  |  | 14.2 |  |  |  | 16.6 |
Other long-term liabilities |  |  | 37.6 |  |  |  | 27.2 |
Long-term liabilities |  | $ | 81.7 |  |  | $ | 74.7 |

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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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