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Special Charges (Table) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Termination benefit costs $ 0.1 $ 8.7 $ 0.1    
DOE Share of Paducah Termination Benefit Costs       $ 0.3  
Payments for one-time termination benefits     (2.3)    
Restructuring liability 6.5   6.5   $ 8.7
Contract Reduction [Member]          
Termination benefit costs     0.1    
Payments for one-time termination benefits     (2.2)    
Restructuring liability 6.3   6.3   8.4
Other Restructuring [Member]          
Termination benefit costs       $ 3.8  
Payments for one-time termination benefits     (0.1)    
Restructuring liability $ 0.2   $ 0.2   $ 0.3