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Transition Charges (Narrative)(Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]          
Direct charges $ 3.9 $ 14.3 $ 8.6 $ 49.2  
Operating expenses 3.9 8.7 8.3 35.7  
Inventory Valuation Adjustments   5.1 0.3 11.7  
Accelerated property, plant and equipment expenses   $ 0.5   $ 1.8  
Restructuring Liability Balance $ 2.4   2.4   $ 2.4
DOE Share of Paducah Termination Benefit Costs     (0.3)    
Special charges for workforce reductions and advisory costs     3.5    
Cash Payable [Member]          
Restructuring Cost and Reserve [Line Items]          
One-time termination benefit costs     3.8    
Severance [Member]          
Restructuring Cost and Reserve [Line Items]          
Payments for one-time termination benefits     $ (3.8)