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Pension and Postretirement Health and Life Benefits
 3 Months Ended
Mar. 31, 2012
Pension and Postretirement Health and Life Benefits  
Pension and Postretirement Health and Life Benefits
 
8. PENSION AND POSTRETIREMENT HEALTH AND LIFE BENEFITS

The components of net benefit costs for pension and postretirement health and life benefit plans were as follows (in millions):
 
   
Defined Benefit Pension Plans
    
Postretirement Health and Life Benefit Plans
  
   
Three Months Ended March 31,
    
Three Months Ended March 31,
  
   
2012
    
2011
    
2012
    
2011
  
Service costs             
   $ 3.6     $ 4.8     $ 0.9     $ 1.3  
Interest costs              
     12.1       12.6       2.8       3.0  
Expected returns on plan assets (gains)            
     (13.0 )     (13.4 )     (0.7 )     (0.9 )
Amortization of prior service costs (credit)   
     0.4       0.4       -       -  
Amortization of actuarial losses     
     4.9       2.5       1.1       0.7  
Curtailment loss       
     -       3.2       -       -  
Net benefit costs        
   $ 8.0     $ 10.1     $ 4.1     $ 4.1  

USEC expects to fund the defined benefit pension plans in 2012 with the required contribution under the Employee Retirement Income Security Act ("ERISA") of $36.1 million, and $0.7 million was contributed in the three months ended March 31, 2012. There is no required contribution for the postretirement health and life benefit plans under ERISA and USEC does not expect to make a contribution in 2012. Certain contributions to the plans are recoverable under USEC's contracts with DOE. USEC receives federal subsidy payments for sponsoring prescription drug benefits that are at least actuarially equivalent to Medicare Part D.