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Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Cash and Cash Equivalents |  |  |
Cash and money market funds |  | $ 50.6 | $ 40.3
Commercial paper |  | 144.7 | 32.2
Total |  | 195.3 | 72.5
Trade Receivables – Net |  |  |
Trade receivables, gross |  | 135.4 | 117.5
Allowance for doubtful receivables |  | (0.8) | (0.8)
Trade receivables – net |  | 134.6 | 116.7
Inventories |  |  |
Finished products |  | 65.2 | 79.5
Work-in-process |  | 78.8 | 63.6
Raw materials |  | 49.9 | 53.4
Operating supplies and repair and maintenance parts |  | 23.6 | 23.1
Total |  | 217.5 | 219.6
Prepaid Expenses and Other Current Assets |  |  |
Current derivative assets |  | 4.6 | 1.5
Current deferred tax assets |  | 0.0 | 49.6
Short-term restricted cash |  | 0.3 | 0.3
Prepaid taxes |  | 2.2 | 0.0
Prepaid Insurance |  | 2.1 | 1.9
Other |  | 3.6 | 3.4
Total | [1] | 12.8 | 56.7
Property, Plant and Equipment – Net |  |  |
Land and improvements |  | 22.7 | 22.7
Buildings and leasehold improvements |  | 83.6 | 71.8
Machinery and equipment |  | 573.8 | 549.0
Construction in progress |  | 45.7 | 48.5
Property, plant and equipment – gross |  | 725.8 | 692.0
Accumulated depreciation |  | (213.4) | (196.9)
Assets held for sale |  | 0.3 | 0.3
Property, plant and equipment – net |  | 512.7 | 495.4
Other Assets |  |  |
Restricted cash |  | 11.0 | 10.9
Deferred financing costs |  | 1.1 | 1.3
Deferred compensation plan assets |  | 7.8 | 7.3
Derivative Asset, Noncurrent |  | 0.8 | 0.1
Total | [1] | 20.7 | 19.6
Other Accrued Liabilities |  |  |
Current derivative liabilities |  | 4.3 | 14.1
Uncleared cash disbursements |  | 7.8 | 8.0
Accrued income taxes and taxes payable |  | 6.7 | 3.1
Accrued annual contribution to VEBAs |  | 0.0 | 19.6
Accrued contingent contribution to Union VEBA |  | 17.1 | 0.0
Short-term environmental accrual |  | 1.4 | 1.6
Accrued interest |  | 3.1 | 1.5
Short-term deferred revenue |  | 0.2 | 1.2
Other |  | 3.6 | 3.6
Total |  | 44.2 | 52.7
Long-Term Liabilities |  |  |
Derivative liabilities |  | 0.7 | 2.1
Income tax liabilities |  | 0.8 | 0.7
Workers’ compensation accruals |  | 24.0 | 21.7
Long-term environmental accruals |  | 16.4 | 17.0
Long-term asset retirement obligations |  | 5.0 | 4.8
Deferred compensation liabilities |  | 8.0 | 7.7
Long-term deferred revenue |  | 0.2 | 0.3
Long-term capital leases |  | 0.1 | 0.1
Long-term portion of contingent contribution to Union VEBA |  | 12.8 | 29.9
Other long-term liabilities |  | 3.4 | 3.2
Total |  | 71.4 | 87.5
Billed |  |  |
Trade Receivables – Net |  |  |
Trade receivables, gross |  | 135.2 | 116.8
Unbilled |  |  |
Trade Receivables – Net |  |  |
Trade receivables, gross |  | $ 0.2 | $ 0.7
[1] | See Note 1 for discussion of our adoption of ASU 2015-03, ASU 2015-15 and ASU 2015-17 (as defined in Note 1).

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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