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Transition Charges (Narrative)(Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Sep. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
DOE Share of Paducah Termination Benefit Costs     $ 0.3  
Payments for one-time termination benefits $ (1.8)      
Restructuring liability $ 6.9     $ 8.7
Contract Reduction [Member]        
Termination benefit costs   $ 8.7    
Other Restructuring [Member]        
Termination benefit costs     $ 0.9