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Supplemental Balance Sheet Information (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Cash and Cash Equivalents. |  |  |  |
Cash and money market funds | $ 68.5 | $ 57.7 |  |
Commercial paper | 117.1 | 111.8 |  |
Total | 185.6 | 169.5 | 248.0 | 273.4
Trade Receivables. |  |  |  |
Trade receivables, gross | 124.3 | 120.6 |  |
Allowance for doubtful receivables | (0.8) | (0.8) |  |
Trade receivables, net | 123.5 | 119.8 |  |
Inventories. |  |  |  |
Finished products | 65.9 | 72.5 |  |
Work-in-process | 66.9 | 75.9 |  |
Raw materials | 51.5 | 47.2 |  |
Operating supplies and repair and maintenance parts | 18.8 | 18.8 |  |
Total | 203.1 | 214.4 |  |
Prepaid Expenses and Other Current Assets. |  |  |  |
Current derivative assets – Notes 8 and 9 | 4.1 | 2.0 |  |
Current deferred tax assets | 36.7 | 36.7 |  |
Short-term restricted cash | 0.3 | 0.3 |  |
Prepaid taxes | 2.8 | 0 |  |
Prepaid expenses | 4.7 | 5.2 |  |
Total | 48.6 | 44.2 |  |
Property, Plant and Equipment - Net. |  |  |  |
Land and improvements | 22.8 | 22.6 |  |
Buildings and leasehold improvements | 54.2 | 53.0 |  |
Machinery and equipment | 455.3 | 425.6 |  |
Construction in progress | 49.3 | 66.0 |  |
Property, plant and equipment, gross | 581.6 | 567.2 |  |
Accumulated depreciation | (144.9) | (137.9) |  |
Total | 436.7 | 429.3 |  |
Other Assets. |  |  |  |
Derivative assets – Notes 8 and 9 | 84.2 | 79.8 |  |
Restricted cash | 9.3 | 9.3 |  |
Deferred financing costs | 8.2 | 8.9 |  |
Deferred compensation plan assets | 6.6 | 6.5 |  |
Other | 0.2 | 0.3 |  |
Total | 108.5 | 104.8 |  |
Other Accrued Liabilities. |  |  |  |
Current derivative liabilities – Notes 8 and 9 | 2.0 | 1.8 |  |
Uncleared cash disbursements | 10.5 | 9.6 |  |
Accrued income taxes and taxes payable | 7.6 | 4.3 |  |
Accrued annual VEBA contribution | 0 | 16.0 |  |
Short-term environmental accrual – Note 7 | 3.6 | 2.8 |  |
Accrued interest | 10.3 | 3.7 |  |
Other | 3.1 | 6.6 |  |
Total | 37.1 | 44.8 |  |
Long-term Liabilities. |  |  |  |
Derivative liabilities – Notes 8 and 9 | 87.7 | 84.3 |  |
Income tax liabilities | 4.9 | 5.0 |  |
Workers’ compensation accruals | 23.4 | 23.3 |  |
Long-term environmental accrual – Note 7 | 18.9 | 20.0 |  |
Long-term asset retirement obligations | 4.1 | 4.0 |  |
Deferred compensation liability | 7.2 | 7.0 |  |
Long-term capital lease | 0.1 | 0.1 |  |
Other long-term liabilities | 2.7 | 2.7 |  |
Total | 149.0 | 146.4 |  |
Long-term Debt. — Note 3 |  |  |  |
Senior notes | 225.0 | 225.0 |  |
Cash convertible senior notes | 165.7 | 163.5 |  |
Total | 390.7 | 388.5 |  |
Billed |  |  |  |
Trade Receivables. |  |  |  |
Trade receivables, gross | 124.1 | 120.2 |  |
Unbilled |  |  |  |
Trade Receivables. |  |  |  |
Trade receivables, gross | $ 0.2 | $ 0.4 |  |

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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 short-term 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. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: 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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- Definition Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid after one year (or the normal operating cycle, if longer). + References No definition available. + Details
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