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Supplemental Balance Sheet Information (Tables) | 9 Months Ended
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Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplemental Balance Sheet Disclosures | emental Balance Sheet Information
| September 30, 2018 |  | December 31, 2017
| (In millions of dollars)
Cash and Cash Equivalents |  |  |
Cash and money market funds | $ | 23.2 |  |  | $ | 23.5 |
Commercial paper | 71.1 |  |  | 27.6 |
Total | $ | 94.3 |  |  | $ | 51.1 |
Trade Receivables, Net |  |  |
Billed trade receivables | $ | 194.2 |  |  | $ | 165.9 |
Unbilled trade receivables | 1.5 |  |  | 0.3 |
Trade receivables, gross | 195.7 |  |  | 166.2 |
Allowance for doubtful receivables | (1.2 | ) |  | (1.2 | )
Trade receivables, net | $ | 194.5 |  |  | $ | 165.0 |
Inventories |  |  |
Finished products | $ | 41.4 |  |  | $ | 63.8 |
Work-in-process | 73.3 |  |  | 78.3 |
Raw materials | 76.2 |  |  | 61.3 |
Operating supplies | 5.3 |  |  | 4.5 |
Total | $ | 196.2 |  |  | $ | 207.9 |
Property, Plant and Equipment, Net |  |  |
Land and improvements | $ | 21.4 |  |  | $ | 21.1 |
Buildings and leasehold improvements | 96.4 |  |  | 92.1 |
Machinery and equipment | 736.3 |  |  | 689.1 |
Construction in progress | 38.1 |  |  | 35.1 |
Property, plant and equipment, gross | 892.2 |  |  | 837.4 |
Accumulated depreciation | (298.4 | ) |  | (267.9 | )
Assets held for sale | 1.6 |  |  | 1.9 |
Property, plant and equipment, net | $ | 595.4 |  |  | $ | 571.4 |
Other Accrued Liabilities |  |  |
Uncleared cash disbursements | $ | 5.6 |  |  | $ | 7.3 |
Accrued income taxes and taxes payable | 8.2 |  |  | 6.8 |
Accrued annual contribution to VEBAs – Note 4 | — |  |  | 15.7 |
Accrued interest | 8.4 |  |  | 2.9 |
Other | 14.8 |  |  | 7.8 |
Total | $ | 37.0 |  |  | $ | 40.5 |
| September 30, 2018 |  | December 31, 2017
| (In millions of dollars)
Long-Term Liabilities |  |  |
Workers' compensation accruals | $ | 24.5 |  |  | $ | 22.6 |
Long-term environmental accrual – Note 7 | 14.4 |  |  | 15.8 |
Other long-term liabilities | 25.8 |  |  | 21.6 |
Total | $ | 64.7 |  |  | $ | 60.0 |

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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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