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Pension and Postretirement Health and Life Benefits
 6 Months Ended
Jun. 30, 2016
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Pension and Postretirement Health and Life Benefits
PENSION AND POSTRETIREMENT HEALTH AND LIFE BENEFITS

The components of net periodic benefit cost (credit) for the pension plans were as follows (in millions):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2016
 
2015
 
2016
 
2015
Service costs
$
0.9

 
$
1.0

 
$
1.9

 
$
2.0

Interest costs
8.9

 
9.3

 
17.7

 
18.6

Expected return on plan assets (gains)
(10.5
)
 
(12.2
)
 
(21.0
)
 
(24.4
)
Actuarial loss (gain) from remeasurement
0.8

 
(3.9
)
 
0.8

 
(3.9
)
Net periodic benefit cost (credit)
$
0.1

 
$
(5.8
)
 
$
(0.6
)
 
$
(7.7
)


In the second quarter of 2016, the level of lump-sum payments under the Company’s non-qualified defined benefit pension plans resulted in the remeasurement of pension obligations under settlement accounting rules. The remeasurement resulted in a loss of $0.8 million included in selling, general and administrative expenses in the second quarter of 2016. The loss includes the effect of a decrease in the discount rate used in the measurement of pension obligations from approximately 4.5% as of December 31, 2015, to approximately 3.7% as of June 30, 2016.

In the second quarter of 2015, the level of lump-sum payments under the Company’s non-qualified defined benefit pension plans and the Employees’ Retirement Plan of Centrus Energy Corp. resulted in a remeasurement gain of $3.9 million included in selling, general and administrative expenses in the second quarter of 2015. The gain included the effect of an increase in the discount rate from approximately 4.1% as of December 31, 2014, to approximately 4.5% as of June 30, 2015.

The components of net periodic benefit cost for the postretirement health and life benefit plans were as follows (in millions):
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2016
 
2015
 
2016
 
2015
Service costs
$
—

 
$
—

 
$
—

 
$
0.1

Interest costs
1.9

 
2.2

 
4.0

 
4.4

Expected return on plan assets (gains)
—

 
(0.3
)
 
(0.1
)
 
(0.5
)
Amortization of prior service (credits), net
—

 
—

 
(0.1
)
 
(0.1
)
Net periodic benefit cost
$
1.9

 
$
1.9

 
$
3.8

 
$
3.9