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Supplemental Balance Sheet Information | 12 Months Ended
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Dec. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Supplemental Balance Sheet Information | 2. Supplemental Balance Sheet Information
|  | As of December 31, |
|  | 2020 |  |  | 2019 |
|  | (In millions of dollars) |
Cash and Cash Equivalents |  |  |  |  |  |  |  |
Cash and money market funds |  | $ | 780.3 |  |  | $ | 28.2 |
Commercial paper |  |  | — |  |  |  | 236.1 |
Total |  | $ | 780.3 |  |  | $ | 264.3 |
Trade Receivables, net |  |  |  |  |  |  |  |
Billed trade receivables |  | $ | 113.6 |  |  | $ | 168.5 |
Allowance for doubtful receivables |  |  | (0.8 | ) |  |  | (1.4 | )
Trade receivables, net |  | $ | 112.8 |  |  | $ | 167.1 |
Inventories |  |  |  |  |  |  |  |
Finished products |  | $ | 37.2 |  |  | $ | 42.6 |
Work-in-process |  |  | 46.0 |  |  |  | 63.5 |
Raw materials |  |  | 62.3 |  |  |  | 65.0 |
Operating supplies |  |  | 6.5 |  |  |  | 6.5 |
Total |  | $ | 152.0 |  |  | $ | 177.6 |
Property, Plant and Equipment, net |  |  |  |  |  |  |  |
Land and improvements |  | $ | 21.5 |  |  | $ | 21.4 |
Buildings and leasehold improvements |  |  | 117.2 |  |  |  | 104.5 |
Machinery and equipment |  |  | 847.4 |  |  |  | 813.5 |
Construction in progress1 |  |  | 37.8 |  |  |  | 33.2 |
Property, plant and equipment, gross |  |  | 1,023.9 |  |  |  | 972.6 |
Accumulated depreciation and amortization |  |  | (398.4 | ) |  |  | (352.2 | )
Assets held for sale |  |  | 1.7 |  |  |  | 1.6 |
Property, plant and equipment, net |  | $ | 627.2 |  |  | $ | 622.0 |
Other Accrued Liabilities |  |  |  |  |  |  |  |
Uncleared cash disbursements |  | $ | 2.1 |  |  | $ | 4.2 |
Accrued income taxes and other taxes payable |  |  | 5.2 |  |  |  | 6.2 |
Accrued annual contribution to VEBAs – Note 5 |  |  | 1.7 |  |  |  | 2.9 |
Accrued interest |  |  | 11.6 |  |  |  | 2.3 |
Short-term environmental accrual – Note 10 |  |  | 3.7 |  |  |  | 5.5 |
Other – Note 3 and Note 8 |  |  | 17.1 |  |  |  | 22.9 |
Total |  | $ | 41.4 |  |  | $ | 44.0 |
Long-Term Liabilities |  |  |  |  |  |  |  |
Workers' compensation accruals |  | $ | 30.6 |  |  | $ | 27.7 |
Long-term environmental accrual – Note 10 |  |  | 15.1 |  |  |  | 11.5 |
Other long-term liabilities |  |  | 32.9 |  |  |  | 27.8 |
Total |  | $ | 78.6 |  |  | $ | 67.0 |
1 | Based on market conditions during the year ended December 31, 2020, we temporarily idled projects within Construction in progress totaling $20.0 million as of December 31, 2020, all of which are expected to resume at a future date.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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