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Transition Charges (Narrative)(Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]                          
Asset Retirement Charges       $ 19.8             $ 19.8    
Inventory Valuation Adjustments                     25.0    
Non-production expenses                     194.2 18.8  
Site expenses                     103.0    
Power Contract Losses                     11.8    
Accelerated property, plant and equipment expenses                     19.4 5.6  
Net defined benefit plan costs for former Portsmouth employees                     8.9 13.2  
One-time termination benefit costs                     24.0 3.9  
Payments for one-time termination benefits                     (13.9) (11.7)  
Restructuring Liability Balance 22.4       0.1           22.4 0.1  
DOE Share of Paducah Termination Benefit Costs                     (1.2)    
Structuring advisory costs                     11.0 8.4  
Curtailment (gain) loss                 1.9 3.2      
Special charges for workforce reductions and advisory costs 47.6 3.5 3.7 2.4 1.2 1.5 3.2 6.4     57.2 12.3 0
Uranium Market Conditions [Member]
                          
Restructuring Cost and Reserve [Line Items]                          
Inventory Valuation Adjustments                     15.2    
Residual Uranium [Member]
                          
Restructuring Cost and Reserve [Line Items]                          
Inventory Valuation Adjustments                     22.7    
Materials and Supplies [Member]
                          
Restructuring Cost and Reserve [Line Items]                          
Inventory Valuation Adjustments                     2.3    
Workforce Reduction Phase One [Member]
                          
Restructuring Cost and Reserve [Line Items]                          
One-time termination benefit costs                     3.2    
DOE Share of Paducah Termination Benefit Costs                     1.2    
Workforce Reduction Phase Two [Member]
                          
Restructuring Cost and Reserve [Line Items]                          
One-time termination benefit costs                     20.8    
DOE Share of Paducah Termination Benefit Costs                     5.0    
Cash Payable [Member]
                          
Restructuring Cost and Reserve [Line Items]                          
One-time termination benefit costs                     25.2 3.4  
Noncash [Member]
                          
Restructuring Cost and Reserve [Line Items]                          
One-time termination benefit costs                       0.5  
Special charges for workforce reductions and advisory costs                     22.2    
Severance [Member]
                          
Restructuring Cost and Reserve [Line Items]                          
Payments for one-time termination benefits                     (4.0) (3.4)  
Restructuring Liability Balance 21.2       0           21.2 0  
Advisory Costs [Member]
                          
Restructuring Cost and Reserve [Line Items]                          
Payments for one-time termination benefits                     (9.9) (8.3)  
Restructuring Liability Balance $ 1.2       $ 0.1           $ 1.2 $ 0.1