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Segment Information (Segment Reporting Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Successor [Member]        
Revenues [Abstract]        
Separative work units $ 42.2   $ 145.8  
Uranium 0.0   43.2  
Revenue from low enriched uranium segment 42.2   189.0  
Contract services 21.1   42.1  
Total Revenue 63.3   231.1  
LEU segment gross profit 5.5   12.7  
Contract services segment gross profit (1.2)   (1.5)  
Gross profit $ 4.3   $ 11.2  
Predecessor [Member]        
Revenues [Abstract]        
Separative work units   $ 104.5   $ 250.1
Uranium   0.0   0.0
Revenue from low enriched uranium segment   104.5   250.1
Contract services   16.7   19.7
Total Revenue   121.2   269.8
LEU segment gross profit   3.7   (16.0)
Contract services segment gross profit   (0.2)   (1.4)
Gross profit   $ 3.5   $ (17.4)