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PENSION AND POSTRETIREMENT BENEFITS
 3 Months Ended
Aug. 30, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
PENSION AND POSTRETIREMENT BENEFITS
PENSION AND POSTRETIREMENT BENEFITS
We have defined benefit retirement plans ("plans") for eligible salaried and hourly employees. Benefits are based on years of credited service and average compensation or stated amounts for each year of service. We also sponsor postretirement plans which provide certain medical and dental benefits ("other postretirement benefits") to qualifying U.S. employees.
Components of pension benefit and other postretirement benefit costs are (includes amounts related to discontinued operations):
 
Pension Benefits
 
Thirteen Weeks Ended
 
August 30,
2015
 
August 24,
2014
Service cost
$
23.8

 
$
22.1

Interest cost
41.0

 
40.4

Expected return on plan assets
(66.9
)
 
(67.0
)
Amortization of prior service cost
0.7

 
0.9

Special termination benefits
—

 
6.9

Benefit cost — Company plans
(1.4
)
 
3.3

Pension benefit cost — multi-employer plans
2.3

 
3.2

Total benefit cost
$
0.9

 
$
6.5

 
Postretirement Benefits
 
Thirteen Weeks Ended
 
August 30,
2015
 
August 24,
2014
Service cost
$
0.1

 
$
0.1

Interest cost
2.0

 
2.5

Amortization of prior service benefit
(2.0
)
 
(2.0
)
Recognized net actuarial loss
—

 
0.9

Total cost
$
0.1

 
$
1.5


During the first quarter of fiscal 2016, we contributed $2.8 million to our pension plans and contributed $5.0 million to our other postretirement plans. Based upon the current funded status of the plans and the current interest rate environment, we anticipate making further contributions of approximately $10.2 million to our pension plans for the remainder of fiscal 2016. We anticipate making further contributions of $18.7 million to our other postretirement plans during the remainder of fiscal 2016. These estimates are based on ERISA guidelines, current tax laws, plan asset performance, and liability assumptions, which are subject to change.
Special termination benefits granted in connection with the formation of Ardent Mills resulted in the recognition of $6.9 million of expense in the first quarter of fiscal 2015. This expense was included in results of discontinued operations.