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Deferred Contractual Obligations (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Loss Contingency, Information about Litigation Matters [Abstract]    
Court of Federal Claims Ruling To CYAPC   $ 126.3
Court Of Federal Claims Ruling To YAEC   73.3
Court Of Federal Claims Ruling To MYAPC   35.8
Connecticut Yankee Proceeds Received 90.0  
Yankee Atomic Proceeds Received 73.3  
Maine Yankee Proceeds Received $ 35.8