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Pension and Postretirement Health and Life Benefits (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Defined Benefit Plan, Contributions by Employer     $ 7.4  
Defined Benefit Plan, Actuarial Gain (Loss) $ 3.9   $ 3.9  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.50%   4.50% 4.10%
Scenario, Forecast [Member]        
Expected defined benefit plan contributions for next fiscal year for non-qualified plans   $ 1.0    
Non-qualified defined benefit pension plans [Member]        
Defined Benefit Plan, Lump Sum Benefits Paid     $ 7.3  
Employees' Retirement Plan of Centrus Energy Corp. [Member]        
Defined Benefit Plan, Lump Sum Benefits Paid     3.1  
Retirement Program Plan for Employees of United States Enrichment Corporation [Member]        
Defined Benefit Plan, Lump Sum Benefits Paid     $ 37.9