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Commitments and Contingencies, Textuals (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2012
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Commitments and Contingencies Disclosure [Abstract] |
Environmental accrual | $ 21.9
Expenditures to be charged to environmental accruals, remainder of 2012 | 0.2
Expenditures to be charged to environmental accruals, 2013 | 3.0
Expenditures to be charged to environmental accruals, 2014 | 2.8
Expenditures to be charged to environmental accruals, 2015 | 0.9
Expenditures to be charged to environmental accruals, 2016 | 0.6
Expenditures to be charged to environmental accruals, thereafter | 14.4
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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