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Quarterly Financial Data (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010
Asset Disposal Charges [Member] |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |
Decrease in net income | $ 0.5 | $ 1.0 | $ 1.2 | $ 2.1 | $ 3.2 | $ 1.8 | $ 1.1 | $ 2.5
Decrease in net income per share | $ 0.005 | $ 0.01 | $ 0.01 | $ 0.02 | $ 0.03 | $ 0.02 | $ 0.01 | $ 0.02
Medical Benefits Reserves [Member] |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |
Decrease in net income |  |  | 1.0 |  |  |  |  |
Decrease in net income per share |  |  | $ 0.01 |  |  |  |  |
Alternative Energy Tax Credits [Member] |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |
Decrease in net income |  |  |  |  | 5.0 | 33.4 |  | 9.2
Decrease in net income per share |  |  |  |  | $ 0.05 | $ 0.33 |  | $ 0.09
Decrease in operating income loss |  |  |  |  |  | $ 111.9 |  |

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- Definition Amount of the item included in the interim period in income from operations that affected period-to-period comparability. Amount represents reversal of income related to alternative fuel mixture tax credits in order to claim the cellulosic biofuel producer credits recorded as a benefit in the provision for income taxes. + References No definition available. + Details
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- Definition Per share amount of the item included in the interim period that affected period-to-period comparability (excluding restatement adjustments). + References No definition available. + Details
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- Definition Amount of the item included in the interim period that affected period-to-period comparability (excluding restatement adjustments). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 28 -Paragraph 31 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6952194&loc=d3e1570-108306 + Details
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