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Supplemental Balance Sheet Information (Tables) | 6 Months Ended
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Jun. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Schedule of Supplemental Balance Sheet Information | Supplemental Balance Sheet Information
|  | As of June 30, 2021 |  |  | As of December 31, 2020 |
|  | (In millions of dollars) |
Trade Receivables, Net |  |  |  |  |  |  |  |
Billed trade receivables |  | $ | 389.9 |  |  | $ | 113.6 |
Allowance for doubtful receivables |  |  | (0.7 | ) |  |  | (0.8 | )
Trade receivables, net |  | $ | 389.2 |  |  | $ | 112.8 |
Inventories1 |  |  |  |  |  |  |  |
Finished products |  | $ | 59.5 |  |  | $ | 37.2 |
Work-in-process |  |  | 160.1 |  |  |  | 46.0 |
Raw materials |  |  | 155.9 |  |  |  | 62.3 |
Operating supplies |  |  | 7.7 |  |  |  | 6.5 |
Total |  | $ | 383.2 |  |  | $ | 152.0 |
Property, Plant and Equipment, Net |  |  |  |  |  |  |  |
Land and improvements |  | $ | 26.6 |  |  | $ | 21.5 |
Buildings and leasehold improvements |  |  | 176.3 |  |  |  | 117.2 |
Machinery and equipment |  |  | 1,106.3 |  |  |  | 847.4 |
Construction in progress2 |  |  | 74.6 |  |  |  | 37.8 |
Property, plant and equipment, gross |  |  | 1,383.8 |  |  |  | 1,023.9 |
Accumulated depreciation and amortization |  |  | (433.9 | ) |  |  | (398.4 | )
Assets held for sale |  |  | 2.0 |  |  |  | 1.7 |
Property, plant and equipment, net |  | $ | 951.9 |  |  | $ | 627.2 |
Other Accrued Liabilities |  |  |  |  |  |  |  |
Uncleared cash disbursements |  | $ | 7.0 |  |  | $ | 2.1 |
Accrued income taxes and other taxes payable |  |  | 9.9 |  |  |  | 5.2 |
Accrued annual contribution to Salaried VEBA |  |  | — |  |  |  | 1.7 |
Accrued interest |  |  | 10.6 |  |  |  | 11.6 |
Short-term environmental accrual – Note 8 |  |  | 3.6 |  |  |  | 3.7 |
Other – Note 3 and Note 6 |  |  | 24.4 |  |  |  | 17.1 |
Total |  | $ | 55.5 |  |  | $ | 41.4 |
Long-Term Liabilities |  |  |  |  |  |  |  |
Workers' compensation accrual |  | $ | 31.3 |  |  | $ | 30.6 |
Long-term environmental accrual – Note 8 |  |  | 13.8 |  |  |  | 15.1 |
Other long-term liabilities |  |  | 30.7 |  |  |  | 31.6 |
Total |  | $ | 75.8 |  |  | $ | 77.3 |
1 | At June 30, 2021 and December 31, 2020 the current cost of our inventory exceeded its stated last-in, first-out (“LIFO”) value by $73.4 million and $8.4 million, respectively. We treated inventory acquired in conjunction with the Warrick acquisition (as defined in Note 4 below) as current year purchases within our existing single LIFO pool.
2 | Based on market conditions during the six months ended June 30, 2021, $19.8 million within Construction in progress as of June 30, 2021 related to temporarily idled projects, all of which are expected to resume at a future date. Temporary idled projects as of December 31, 2020 totaled $20.0 million.

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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/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 3 -Paragraph i -Subsection 10 + Details
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