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Retirement Plans (Tables)
6 Months Ended
Jun. 20, 2015
Compensation and Retirement Disclosure [Abstract]  
Summary of Net Pension and SERP Expense Recognized
A summary of net pension and Supplemental Executive Retirement Plan expense recognized by the Company is as follows:
 
12 Weeks Ended
 
24 Weeks Ended
(In millions)
June 20,
2015
 
June 14,
2014
 
June 20,
2015
 
June 14,
2014
Service cost pertaining to benefits earned during the period
$
2.1

 
$
1.6

 
$
4.2

 
$
3.3

Interest cost on projected benefit obligations
4.3

 
4.6

 
8.5

 
9.3

Expected return on pension assets
(4.8
)
 
(5.1
)
 
(9.5
)
 
(10.2
)
Net amortization loss
4.9

 
1.8

 
9.7

 
3.5

Net pension expense
$
6.5

 
$
2.9

 
$
12.9

 
$
5.9