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Commitments, Contingencies and Legal Proceedings (Details) (USD $)
 3 Months Ended
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