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Commitments and Contingencies, Environmental Contingencies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Accrual for Environmental Loss Contingencies Roll Forward |  |  |
Beginning balance | $ 20.2 | $ 9.7 | $ 9.6
Additional accruals | 3.9 | 13.9 | 2.4
Less expenditures | (2.1) | (3.4) | (2.3)
Ending balance | 22.0 | 20.2 | 9.7
Accrual for Environmental Loss Contingencies |  |  |
Environmental accrual to be spent in 2012 | 1.2 |  |
Environmental accrual to be spent in 2013 | 3.6 |  |
Environmental accrual to be spent in 2014 | 1.8 |  |
Environmental accrual to be spent in 2015 | 0.8 |  |
Environmental accrual to be spent in 2016 | 0.6 |  |
Environmental accrual to be spent in 2017 and years thereafter | 14.0 |  |
Environmental contingency loss exposure in excess of accrual | $ 21.7 |  |
Expected period related to remediation expenditures for environmental contingencies | 30 years |  |
Expected period related to excess environmental costs over current accruals | 30 years |  |
Time period within which Companys recorded estimate of its obligation may change | 12 months |  |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 96-1 -Paragraph 161 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349 + Details
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