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Supplemental Balance Sheet Information (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Cash and Cash Equivalents. |  |  |  |
Cash and money market funds | $ 82.9 | $ 107.9 |  |
Commercial paper | 165.1 | 165.5 |  |
Total | 248.0 | 273.4 | 77.3 | 49.8
Trade Receivables. |  |  |  |
Billed trade receivables | 140.1 | 124.4 |  |
Unbilled trade receivables | 2.5 | 0.2 |  |
Trade receivables, gross | 142.6 | 124.6 |  |
Allowance for doubtful receivables | (0.8) | (0.8) |  |
Trade receivables, net | 141.8 | 123.8 |  |
Inventories. |  |  |  |
Finished products | 61.2 | 59.9 |  |
Work-in-process | 68.0 | 55.5 |  |
Raw materials | 52.8 | 53.9 |  |
Operating supplies and repair and maintenance parts | 17.3 | 16.7 |  |
Total | 199.3 | 186.0 |  |
Prepaid Expenses and Other Current Assets. |  |  |  |
Current derivative assets – Notes 8 and 9 | 1.5 | 3.0 |  |
Current deferred tax assets | 59.5 | 59.5 |  |
Current portion of option premiums paid – Notes 8 and 9 | 0.1 | 0.1 |  |
Short-term restricted cash | 1.3 | 1.3 |  |
Prepaid taxes | 4.7 | 2.1 |  |
Prepaid expenses | 3.9 | 4.1 |  |
Total | 71.0 | 70.1 |  |
Property, Plant and Equipment - Net. |  |  |  |
Land and improvements | 22.6 | 22.6 |  |
Buildings and leasehold improvements | 51.7 | 50.9 |  |
Machinery and equipment | 403.5 | 400.4 |  |
Construction in progress | 25.6 | 20.8 |  |
Active property, plant and equipment, gross | 503.4 | 494.7 |  |
Accumulated depreciation | (118.0) | (111.4) |  |
Active property, plant and equipment, net | 385.4 | 383.3 |  |
Idled equipment | 1.0 | 1.0 |  |
Total | 386.4 | 384.3 |  |
Other Assets. |  |  |  |
Derivative assets – Notes 8 and 9 | 61.8 | 55.5 |  |
Restricted cash | 10.0 | 10.0 |  |
Long-term income tax receivable | 0 | 2.9 |  |
Deferred financing costs | 11.0 | 11.7 |  |
Available for sale securities | 5.8 | 5.6 |  |
Other | 0.2 | 0.3 |  |
Total | 88.8 | 86.0 |  |
Other Accrued Liabilities. |  |  |  |
Current derivative liabilities – Notes 8 and 9 | 3.1 | 3.1 |  |
Current portion of option premiums received – Notes 8 and 9 | 0.1 | 0.1 |  |
Accrued book overdraft (uncleared cash disbursement) | 5.7 | 4.7 |  |
Accrued income taxes and taxes payable | 5.4 | 3.1 |  |
Accrued annual VEBA contribution | 0 | 20.0 |  |
Short-term environmental accrual – Note 7 | 4.7 | 3.0 |  |
Accrued interest | 10.3 | 3.7 |  |
Short-term deferred revenue | 4.6 | 6.7 |  |
Other | 4.5 | 7.4 |  |
Total | 38.4 | 51.8 |  |
Long-term Liabilities. |  |  |  |
Derivative liabilities – Notes 8 and 9 | 68.8 | 63.5 |  |
Income tax liabilities | 11.9 | 15.1 |  |
Workers’ compensation accruals | 23.5 | 24.0 |  |
Long-term environmental accrual – Note 7 | 17.3 | 18.7 |  |
Long-term asset retirement obligations | 3.9 | 3.8 |  |
Deferred compensation liability | 6.2 | 5.8 |  |
Long-term capital lease | 0.2 | 0.2 |  |
Other long-term liabilities | 3.4 | 3.4 |  |
Total | 135.2 | 134.5 |  |
Long-term Debt. — Note 3 |  |  |  |
Senior notes | 225.0 | 225.0 |  |
Cash convertible senior notes | 157.3 | 155.3 |  |
Total | $ 382.3 | $ 380.3 |  |

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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 AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 80 -Subparagraph Exhibit 4-8, 3 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
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- Definition Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + 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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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section A -Paragraph 4, 21 -Chapter 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 210.5-02.3(c)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph c(3) -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 310 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6471842&loc=d3e55302-109406 + Details
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