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Retirement Plans
 6 Months Ended
Nov. 23, 2014
Compensation and Retirement Disclosure [Abstract]  
Retirement Plans
Retirement Plans
Components of net periodic benefit cost are as follows:
 
 
Defined Benefit Plans
 
 
Three Months Ended
 
Six Months Ended
(in millions)
 
November 23,
2014
 
November 24,
2013
 
November 23,
2014
 
November 24,
2013
Service cost
 
$
0.3

 
$
1.1

 
$
0.5

 
$
2.2

Interest cost
 
2.9

 
2.6

 
5.0

 
5.1

Expected return on plan assets
 
(4.5
)
 
(4.3
)
 
(7.6
)
 
(8.6
)
Recognized net actuarial loss
 
0.8

 
2.3

 
1.3

 
4.6

Net periodic benefit cost
 
$
(0.5
)
 
$
1.7

 
$
(0.8
)
 
$
3.3

 
 
 
Postretirement Benefit Plan
 
 
Three Months Ended
 
Six Months Ended
(in millions)
 
November 23,
2014
 
November 24,
2013
 
November 23,
2014
 
November 24,
2013
Service cost
 
$
0.1

 
$
0.2

 
$
0.3

 
$
0.4

Interest cost
 
0.4

 
0.3

 
0.8

 
0.6

Recognized net actuarial loss
 
0.2

 
—

 
0.3

 
—

Net periodic benefit cost
 
$
0.7

 
$
0.5

 
$
1.4

 
$
1.0



During the second quarter of fiscal 2015, the retiree health care plan was changed from a self-insured plan to a retiree health exchange with a subsidy to eligible participants through a Health Reimbursement Account (HRA). As a result of these changes, the plan was remeasured resulting in a $23.7 million pre-tax reduction in the accumulated postretirement benefit obligation which is reflected as a prior year service credit. This credit is being amortized into expense over the expected remaining service period of the fully eligible active participant population and is expected to reduce fiscal 2015 expense by $3.4 million.