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Transition Charges (Narrative)(Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended 18 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Dec. 31, 2012
Jun. 30, 2014
Cash Payable [Member]
Dec. 31, 2013
Cash Payable [Member]
Dec. 31, 2013
Severance [Member]
Jun. 30, 2014
Severance [Member]
Dec. 31, 2013
Noncash [Member]
Jun. 30, 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 $ 5.1 $ 10.0 $ 11.7 $ 10.0                      
Non-production expenses 14.3 70.0 49.2 75.7                      
Site expenses 8.7 23.4 35.7 26.4                      
Accelerated property, plant and equipment expenses 0.5 5.5 1.8 8.2                      
Asset retirement charges   19.3                          
Power contract losses   11.8   11.8                      
One-time termination benefit costs 4.1   4.2     29.4   4.2 25.2            
Payments for one-time termination benefits     (13.0)   (13.9)         (4.0) (11.8)   (1.2) (9.9)  
DOE Share of Paducah Termination Benefit Costs (1.6)   (2.2)   (1.2) (3.4)                  
Structuring advisory costs       4.7 11.0                    
Restructuring Liability Balance 13.6   13.6   22.4 13.6 0.1     21.2 13.6     1.2 0.1
Restructuring Charges 2.5 3.7 2.0 6.1 57.2             22.2      
Reorganization items, advisory fees $ 4.7   $ 11.9