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Supplemental Balance Sheet Information (Tables) | 6 Months Ended
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Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Supplemental Balance Sheet Disclosures | Supplemental Balance Sheet Information
| June 30, 2018 |  | December 31, 2017
| (In millions of dollars)
Cash and Cash Equivalents |  |  |
Cash and money market funds | $ | 18.1 |  |  | $ | 23.5 |
Commercial paper | 145.9 |  |  | 27.6 |
Total | $ | 164.0 |  |  | $ | 51.1 |
| June 30, 2018 |  | December 31, 2017
| (In millions of dollars)
Trade Receivables, Net |  |  |
Billed trade receivables | $ | 191.5 |  |  | $ | 165.9 |
Unbilled trade receivables | 0.9 |  |  | 0.3 |
Trade receivables, gross | 192.4 |  |  | 166.2 |
Allowance for doubtful receivables | (1.2 | ) |  | (1.2 | )
Trade receivables, net | $ | 191.2 |  |  | $ | 165.0 |
Inventories |  |  |
Finished products | $ | 36.8 |  |  | $ | 63.8 |
Work-in-process | 61.5 |  |  | 78.3 |
Raw materials | 73.7 |  |  | 61.3 |
Operating supplies | 5.2 |  |  | 4.5 |
Total | $ | 177.2 |  |  | $ | 207.9 |
Property, Plant and Equipment, Net |  |  |
Land and improvements | $ | 21.1 |  |  | $ | 21.1 |
Buildings and leasehold improvements | 92.9 |  |  | 92.1 |
Machinery and equipment | 719.7 |  |  | 689.1 |
Construction in progress | 36.6 |  |  | 35.1 |
Property, plant and equipment, gross | 870.3 |  |  | 837.4 |
Accumulated depreciation | (288.0 | ) |  | (267.9 | )
Assets held for sale | 1.9 |  |  | 1.9 |
Property, plant and equipment, net | $ | 584.2 |  |  | $ | 571.4 |
Other Accrued Liabilities |  |  |
Uncleared cash disbursements | $ | 6.4 |  |  | $ | 7.3 |
Accrued income taxes and taxes payable | 7.2 |  |  | 6.8 |
Accrued annual contribution to VEBAs – Note 3 | — |  |  | 15.7 |
Accrued interest | 2.9 |  |  | 2.9 |
Other | 13.4 |  |  | 7.8 |
Total | $ | 29.9 |  |  | $ | 40.5 |
Long-Term Liabilities |  |  |
Workers' compensation accruals | $ | 23.3 |  |  | $ | 22.6 |
Long-term environmental accrual – Note 6 | 14.5 |  |  | 15.8 |
Other long-term liabilities | 24.8 |  |  | 21.6 |
Total | $ | 62.6 |  |  | $ | 60.0 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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