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Commitment and Contingencies (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
6 Months Ended 9 Months Ended
Jun. 30, 2014
Mar. 31, 2015
Scenario, Forecast [Member]
Sep. 30, 2014
Scenario, Forecast [Member]
ACTDO DOE Funding – Increment 1     $ 33.7
ACTDO DOE Funding – Exercised Contract Total     75.3
ACTDO DOE Funding – Monthly   6.9 6.7
ACTDO DOE Funding – Option   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 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