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Pension and Postretirement Health and Life Benefits
 3 Months Ended
Mar. 31, 2013
Pension and Postretirement Health and Life Benefits  
Pension and Postretirement Health and Life Benefits
10. 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,
2013
2012
2013
2012
Service costs
$ 3.7 $ 3.6 $ 0.9 $ 0.9
Interest costs
11.0 12.1 2.2 2.8
Expected returns on plan assets (gains)
(12.8 ) (13.0 ) (0.6 ) (0.7 )
Amortization of prior service costs
0.2 0.4 - -
Amortization of actuarial (gains) losses, net
 6.1 4.9 0.7 1.1
Net benefit costs
$ 8.2 $ 8.0 $ 3.2 $ 4.1

USEC expects to contribute $23.4 million to the defined benefit pension plans in 2013, consisting of $20.9 million of required contributions under the Employee Retirement Income Security Act ("ERISA") and $2.5 million to non-qualified plans. USEC has contributed $1.3 million in the three months ended March 31, 2013.

There is no required contribution for the postretirement health and life benefit plans under ERISA and USEC does not expect to contribute in 2013. USEC receives federal subsidy payments for sponsoring prescription drug benefits that are at least actuarially equivalent to Medicare Part D.

Net periodic benefit costs related to continued operations are allocated to SWU inventory costs, selling, general and administrative expense, and advanced technology costs.