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Pension and Postretirement Health and Life Benefits
 6 Months Ended
Jun. 30, 2011
Pension and Postretirement Health and Life Benefits  
Pension and Postretirement Health and Life Benefits
9. 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 Benefits Plans
  
   
Three Months Ended
June 30,
    
Six Months Ended
June 30,
    
Three Months Ended
June 30,
    
Six Months Ended
June 30,
  
   
2011
    
2010
    
2011
    
2010
    
2011
    
2010
    
2011
    
2010
  
Service costs
  $ 3.2     $ 4.9     $ 8.0     $ 9.7     $ 1.4     $ 1.3     $ 2.7     $ 2.5  
Interest costs
    12.5       12.2       25.1       24.4       3.1       2.9       6.1       5.9  
Expected return on plan assets
(gains)
    (13.5 )     (12.3 )     (26.9 )     (24.4 )     (0.9 )     (0.9 )     (1.8 )     (1.8 )
Amortization of prior service costs
(credits)
     0.4       0.5       0.8       0.9       -       (2.1 )     -       (4.2 )
Amortization of actuarial losses
    2.2       4.0       4.7       8.0       0.6       0.6       1.3       1.3  
Curtailment losses
    -       -       3.2       -       1.9       -       1.9       -  
Net benefit costs
  $ 4.8     $ 9.3     $ 14.9     $ 18.6     $ 6.1     $ 1.8     $ 10.2     $ 3.7  

USEC expects total cash contributions to the plans in 2011 will be as follows: $14.6 million for the defined benefit pension plans and $4.8 million for the postretirement health and life benefit plans. Of those amounts, contributions made as of June 30, 2011 were $9.0 million and $3.2 million related to the defined benefit pension plans and postretirement health and life benefit plans, respectively.

The elimination of expected years of future service for certain employees at the Portsmouth site (see Note 6) in the actuarial calculation resulted in a curtailment loss of $3.2 million for the defined benefit pension plan in the first quarter of 2011. Similarly, a curtailment loss of $1.9 million for the postretirement health and life benefit plans was recognized in the second quarter of 2011 based on greater clarity of employee decisions regarding the plan offered by the new employer and further refinement of actuarial assumptions. The curtailment losses are included in cost of sales for the contract services segment.