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Commitment and Contingencies (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 5 Months Ended
Mar. 31, 2014
Sep. 30, 2014
Scenario, Forecast [Member]
ACTDO DOE Funding – Increment 1   $ 33.7
ACTDO DOE Funding – Monthly   6.7
ACTDO DOE Funding – Each of Two Options   41.7
ACTDO DOE Funding – Total   117
NYSE 30-day Average Minimum Market Capitalization 50  
NYSE Minimum 30 Day Average Closing Price $ 1.00  
NYSE 30-Day Market Capitalization Subject to Suspension 15  
PBGC estimate of potential Portsmouth pension liability $ 130  
Minimum Paducah SWU Production Under 2002 DOE-USEC Agreement 3,500,000