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Commitments, Contingencies and Legal Proceedings (Details) (USD $) | 3 Months Ended |
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Mar. 31, 2013 OperableUnit | Jan. 31, 2008 Respondents
Commitments Contingencies and Legal Proceedings (Textual) [Abstract] |  |
Aggregate of response actions response costs and NRDs | $ 1,000,000,000 |
Number of operable units | 5 |
Number of Respondents |  | 2
Cost of response incurred by government | 4,280,000 |
Estimated cost of remediation made by government to all parties | 1,000,000,000 |
Reasonable outside estimate for cost of remediation made by government to all parties | 1,500,000,000 |
Estimated future cost of work yet to be done | 360,000,000 |
Annual estimated cost rate seeks by government | 70,000,000 |
Initial minimum amount of NRD assessment | 176,000,000 |
Initial maximum amount of NRD assessment | 333,000,000 |
Revised minimum amount of NRD assessment | 287,000,000 |
Revised maximum amount of NRD assessment | 423,000,000 |
The limitation period for the NRD's claims | 3 years |
Reserve for claiming liability | 16,400,000 |
Reserve for environmental liability, current portion | 100,000 |
Maximum estimated percentage of discharge | 27.00% |
Maximum estimated cost related to Fox River Matter | $ 275,000,000 |
Period over which estimated cost accrued | 10 years |

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