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Supplemental Balance Sheet Information | 6 Months Ended
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Jun. 30, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Supplemental Balance Sheet Information | 2. Supplemental Balance Sheet Information
|  | June 30, 2020 |  |  | December 31, 2019 |
|  | (In millions of dollars) |
Cash and Cash Equivalents |  |  |  |  |  |  |  |
Cash and money market funds |  | $ | 710.6 |  |  | $ | 28.2 |
Commercial paper |  |  | — |  |  |  | 236.1 |
Total |  | $ | 710.6 |  |  | $ | 264.3 |
Trade Receivables, Net |  |  |  |  |  |  |  |
Billed trade receivables |  | $ | 127.5 |  |  | $ | 168.5 |
Allowance for doubtful receivables |  |  | (1.1 | ) |  |  | (1.4 | )
Trade receivables, net |  | $ | 126.4 |  |  | $ | 167.1 |
Inventories1 |  |  |  |  |  |  |  |
Finished products |  | $ | 40.8 |  |  | $ | 42.6 |
Work-in-process |  |  | 62.7 |  |  |  | 63.5 |
Raw materials |  |  | 71.3 |  |  |  | 65.0 |
Operating supplies |  |  | 6.6 |  |  |  | 6.5 |
Total |  | $ | 181.4 |  |  | $ | 177.6 |
Property, Plant and Equipment, Net |  |  |  |  |  |  |  |
Land and improvements |  | $ | 21.6 |  |  | $ | 21.4 |
Buildings and leasehold improvements |  |  | 110.2 |  |  |  | 104.5 |
Machinery and equipment |  |  | 826.9 |  |  |  | 813.5 |
Construction in progress2 |  |  | 42.0 |  |  |  | 33.2 |
Property, plant and equipment, gross |  |  | 1,000.7 |  |  |  | 972.6 |
Accumulated depreciation |  |  | (375.1 | ) |  |  | (352.2 | )
Assets held for sale |  |  | 1.5 |  |  |  | 1.6 |
Property, plant and equipment, net |  | $ | 627.1 |  |  | $ | 622.0 |
Other Accrued Liabilities |  |  |  |  |  |  |  |
Uncleared cash disbursements |  | $ | 3.3 |  |  | $ | 4.2 |
Accrued income taxes and taxes payable |  |  | 8.4 |  |  |  | 6.2 |
Accrued annual contribution to Salaried VEBA |  |  | — |  |  |  | 2.9 |
Accrued interest |  |  | 11.8 |  |  |  | 2.3 |
Short-term environmental accrual – Note 7 |  |  | 6.6 |  |  |  | 5.5 |
Other – Note 3 and Note 5 |  |  | 24.4 |  |  |  | 22.9 |
Total |  | $ | 54.5 |  |  | $ | 44.0 |
Long-Term Liabilities |  |  |  |  |  |  |  |
Workers' compensation accrual3 |  | $ | 29.6 |  |  | $ | 27.7 |
Long-term environmental accrual – Note 7 |  |  | 11.6 |  |  |  | 11.5 |
Other long-term liabilities |  |  | 34.1 |  |  |  | 27.8 |
Total |  | $ | 75.3 |  |  | $ | 67.0 |
1 | At June 30, 2020, the stated LIFO value of our inventory exceeded its current cost by $11.0 million. At December 31, 2019, the current cost of our inventory exceeded its stated LIFO value by $11.9 million.
2 | Based on market conditions during the quarter ended June 30, 2020, we temporarily idled $23.9 million of Construction in progress as of June 30, 2020, all of which is expected to resume at a future date.
3 | Our workers' compensation accrual was estimated using a discount rate of 1.00% and 1.75% at June 30, 2020 and December 31, 2019, respectively. The undiscounted workers' compensation liabilities were estimated at $30.3 million and $29.2 million as of June 30, 2020 and December 31, 2019, 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://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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