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Retirement Plans
6 Months Ended
Nov. 25, 2012
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 25,
2012
 
November 27,
2011
 
November 25,
2012
 
November 27,
2011
Service cost
 
$
1.2

 
$
1.3

 
$
2.4

 
$
2.7

Interest cost
 
2.5

 
2.3

 
5.0

 
4.5

Expected return on plan assets
 
(4.7
)
 
(4.4
)
 
(9.7
)
 
(8.9
)
Recognized net actuarial loss
 
2.2

 
1.5

 
4.4

 
3.1

Net periodic benefit cost
 
$
1.2

 
$
0.7

 
$
2.1

 
$
1.4

 
 
 
Postretirement Benefit Plan
 
 
Three Months Ended
 
Six Months Ended
(in millions)
 
November 25,
2012
 
November 27,
2011
 
November 25,
2012
 
November 27,
2011
Service cost
 
$
0.2

 
$
0.2

 
$
0.4

 
$
0.4

Interest cost
 
0.3

 
0.4

 
0.6

 
0.7

Net periodic benefit cost
 
$
0.5

 
$
0.6

 
$
1.0

 
$
1.1