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Fair Value Measurements, Fair Value of Non financial Assets and Liabilities (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Idled assets | $ 5.4 | $ 5.5 |  |
Idled assets subsequently placed into service | 0.1 |  |  |
Asset Retirement Obligation, Roll Forward |  |  |  |
Beginning balance | 3.8 | 3.5 |  | 3.3
Liabilities incurred during the period | 0 | 0 |  | 0
Liabilities settled during the period | (0.1) | 0 |  | 0
Accretion expense | 0.3 | 0.3 |  | 0.2
Adjustment to accretion expense due to revisions to estimated cash flow | 0 | (1.1) | [1] | 0
Revisions to estimated cash flow | 0 | 1.1 |  | 0
Ending balance | 4.0 | 3.8 |  | 3.5
Increase in basic earnings per share resulting from adjustment |  | $ 0.05 |  |
Increase in diluted earnings per share resulting from adjustment |  | $ 0.05 |  |
Weighted average credit-adjusted risk free rate | 9.10% | 9.10% |  |
Tulsa, Oklahoma Facility |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Idled assets |  | 1.1 |  |
Assets acquired but not yet placed into service |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Idled assets |  | $ 4.4 |  |
[1] | The adjustment increased both basic and diluted earnings per share for 2010 by approximately $0.05 per share.

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 3, 10, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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