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COMMITMENTS AND CONTINGENCIES Narrative: Contingencies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Loss Contingencies [Line Items]  
Loss Contingency Accrual, at Carrying Value $ 42.6
Grace Energy Corporation Matter
 
Loss Contingencies [Line Items]  
Court Judgment, Remediation Costs Not Recoverable by Plaintiff 3.5
Court Judgment, Attorney Costs Awarded to Plaintiff 1.8
Deptartment of Justice Estimated Remediation Expenses 71.9
Loss Contingencies, Estimated Settlement Payment 11.7
Eres Matter
 
Loss Contingencies [Line Items]  
Loss Contingencies Allegations 78.1
Loss Contingencies Settlement Amount $ 33.5