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Supplemental Balance Sheet Information (Tables) | 12 Months Ended
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Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Supplemental Balance Sheet Information |
|  | As of December 31, |
|  | 2022 |  |  | 2021 |
|  | (In millions of dollars) |
Trade Receivables, net |  |  |  |  |  |
Billed trade receivables |  | $ | 297.7 |  |  | $ | 333.5 |
Allowance for doubtful receivables |  |  | (0.5 | ) |  |  | (0.8 | )
Trade receivables, net |  | $ | 297.2 |  |  | $ | 332.7 |
Inventories |  |  |  |  |  |
Finished products |  | $ | 98.0 |  |  | $ | 90.3 |
Work-in-process |  |  | 242.5 |  |  |  | 162.2 |
Raw materials |  |  | 174.0 |  |  |  | 143.0 |
Operating supplies |  |  | 10.9 |  |  |  | 9.1 |
Total |  | $ | 525.4 |  |  | $ | 404.6 |
Property, Plant and Equipment, net |  |  |  |  |  |
Land and improvements |  | $ | 28.4 |  |  | $ | 26.0 |
Buildings and leasehold improvements |  |  | 185.5 |  |  |  | 179.0 |
Machinery and equipment |  |  | 1,232.7 |  |  |  | 1,151.5 |
Construction in progress 1 |  |  | 141.3 |  |  |  | 75.3 |
Property, plant and equipment, gross |  |  | 1,587.9 |  |  |  | 1,431.8 |
Accumulated depreciation and amortization |  |  | (574.9 | ) |  |  | (480.4 | )
Assets held for sale |  |  | 0.2 |  |  |  | 3.8 |
Property, plant and equipment, net |  | $ | 1,013.2 |  |  | $ | 955.2 |
Other Accrued Liabilities |  |  |  |  |  |
Uncleared cash disbursements |  | $ | 13.6 |  |  | $ | 10.9 |
Accrued income taxes and other taxes payable |  |  | 8.9 |  |  |  | 9.5 |
Accrued interest |  |  | 9.9 |  |  |  | 9.9 |
Short-term environmental accrual – Note 10 |  |  | 1.1 |  |  |  | 2.6 |
Other – Note 3 and Note 8 |  |  | 34.9 |  |  |  | 25.5 |
Total |  | $ | 68.4 |  |  | $ | 58.4 |
Long-Term Liabilities |  |  |  |  |  |
Workers' compensation accruals |  | $ | 30.9 |  |  | $ | 31.9 |
Long-term environmental accrual – Note 10 |  |  | 16.6 |  |  |  | 14.2 |
Other long-term liabilities |  |  | 27.2 |  |  |  | 26.4 |
Total |  | $ | 74.7 |  |  | $ | 72.5 |
1 Based on market conditions, we temporarily idled projects within Construction in progress totaling $21.9 million and $24.9 million as of December 31, 2022 and December 31, 2021, respectively, all of which are expected to resume at a future date.

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- Definition Tabular disclosure of condensed balance sheet, including, but not limited to, balance sheets of consolidated entities and consolidation eliminations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph (a) -Subsection 04 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 + Details
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