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Transition Charges (Narrative)(Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Workforce Reduction Phase One [Member]
Mar. 31, 2014
Cash Payable [Member]
Dec. 31, 2013
Cash Payable [Member]
Mar. 31, 2014
Severance [Member]
Dec. 31, 2013
Severance [Member]
Dec. 31, 2013
Noncash [Member]
Mar. 31, 2014
Advisory Costs [Member]
Dec. 31, 2013
Advisory Costs [Member]
Dec. 31, 2012
Advisory Costs [Member]
Restructuring Cost and Reserve [Line Items]                          
Inventory Valuation Adjustments $ 6.6                        
Non-production expenses 34.9 5.8                      
Site expenses 27.0 3.0                      
Accelerated property, plant and equipment expenses 1.3 2.8                      
One-time termination benefit costs     24.0     0.1 25.2            
Payments for one-time termination benefits (3.9)   (13.9)         (2.7) (4.0)   (1.2) (9.9)  
DOE Share of Paducah Termination Benefit Costs (0.6)   (1.2)   (1.2)                
Structuring advisory costs   2.4 11.0                    
Restructuring Liability Balance 18.6   22.4 0.1       18.6 21.2     1.2 0.1
Restructuring Charges (0.5) 2.4 57.2             22.2      
Reorganization items, advisory fees $ 7.2