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Transition Charges (Narrative)(Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Restructuring Cost and Reserve [Line Items]        
Asset Retirement Charges $ 19.3   $ 19.3  
Inventory Valuation Adjustments     10.0  
Inventory Valuation Adjustments, Uranium     7.7  
Site Expenses - Other Operating Costs     20.1  
Power Contract Losses     11.8  
Accelerated propery, plant and equipment expenses     8.2  
Net defined benefit plan costs for former Portsmouth employees     6.3 6.6
One-time termination benefit costs 2.1 1.7   3.6
DOE Share of Paducah Termination Benefit Costs 6.0      
Structuring advisory costs 2.3 1.5 4.7 6.0
Curtailment (gains) 0.7      
Minimum [Member]
        
Restructuring Cost and Reserve [Line Items]        
Estimated Near-Term Termination Benefit Costs 2.1      
Estimated Total Paducah Termination Benefit Costs 25.0      
Maximum [Member]
        
Restructuring Cost and Reserve [Line Items]        
Estimated Near-Term Termination Benefit Costs 7.5      
Estimated Total Paducah Termination Benefit Costs $ 30.0