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Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Income Taxes (Textual) [Abstract] |  |  |  |
Deferred taxes and other included a deferred tax benefit | $ 2.3 | $ 1.5 | $ 17.6 |
Other taxes total expense | 0.1 | 1.8 | 0.8 |
Federal income tax rate | 35.00% | 35.00% | 35.00% |
Valuation allowance | 30.5 |  |  |
Research and development, tax credit | 0.4 | 1.0 | 2.6 |
Unremitted earnings, reinvested | 236.3 | 197.4 |  |
Cellulosic biofuel credit per gallon of black liquor produced | 1.01 |  |  |
Claimed income tax |  |  |  | 23.2
Convertible portion of the previously utilized refundable alternative fuel mixture credit | 0.50 |  |  |
Income tax benefit from conversion to cellulosic biofuel | 4.0 |  |  |
Return to Internal Revenue Service | 14.1 |  |  |
Gross unrecognized tax benefits | 30.4 | 29.7 | 38.7 | 40.1
Unrecognized tax benefits that would impact effective tax rate | 30.4 |  |  |
Reserve for an uncertain tax position | 2.2 |  |  |
Lower range of gross unrecognized tax benefits balance may decrease within the next twelve months | 0 |  |  |
Higher range of gross unrecognized tax benefits balance may decrease within the next twelve months | 17.9 |  |  |
Net reduction of interest benefit | 0.3 | 2.1 |  |
Liability for interest | 1.4 | 1.7 | 3.8 |
Penalties associated with uncertain tax positions | 0 | 0 | 0 |
State And Local Jurisdiction [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards | 68.7 |  |  |
Tax credit carryforwards | 0.4 |  |  |
Foreign Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards | 247.9 |  |  |
Tax credit carryforwards | 3.8 |  |  |
Domestic Country [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforwards | $ 0.3 |  |  |

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- Definition The component of income tax expense representing amounts paid or payable (or refundable) which are classified as "income taxes" as determined by applying the provisions of enacted tax law to other than the taxable Income or Loss from continuing operations for the period. Items affecting income taxes and required to be disclosed, but not included elsewhere, would also be designated as "Other". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph c, d, e, f -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319 + Details
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