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Commitments and Contingencies, Textuals (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012
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Commitments and Contingencies Disclosure [Abstract] |
Environmental accrual | $ 21.7
Expenditures to be charged to environmental accruals, 2012 | 1.0
Expenditures to be charged to environmental accruals, 2013 | 3.6
Expenditures to be charged to environmental accruals, 2014 | 1.8
Expenditures to be charged to environmental accruals, 2015 | 0.8
Expenditures to be charged to environmental accruals, 2016 | 0.6
Expenditures to be charged to environmental accruals, thereafter | 13.9
Potential increase in environmental costs | $ 18.7
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AICPA -Name Statement of Position (SOP) -Number 96-1 -Paragraph 161 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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